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AF Informatica - Applicazioni Internet Rich accessibili ( WAI-ARIA ) 1.1

Applicazioni Internet Rich accessibili ( WAI-ARIA ) 1.1

 

Applicazioni Internet Rich accessibili ( WAI-ARIA ) 1.1     

Raccomandazione W3C

Questa versione:  
https://www.w3.org/TR/2017/REC-wai-aria-1.1-20171214/
Ultima versione pubblicata:
https://www.w3.org/TR/wai-aria-1.1/
Ultima bozza del redattore:
https://w3c.github.io/aria/
Rapporto di attuazione:
https://w3c.github.io/test-results/wai-aria/
Versione precedente:
https://www.w3.org/TR/2017/PR-wai-aria-1.1-20171102/
Raccomandazione precedente:
https://www.w3.org/TR/wai-aria-1.0/
Editors:
Joanmarie Diggs , Igalia, SL,
Shane McCarron , Spec-Ops,
Michael Cooper , W3C ,
Richard Schwerdtfeger , IBM Corporation, (fino a ottobre 2017)
James Craig , Apple Inc., (fino a maggio 2016)

Si prega di controllare l' errata per eventuali errori o problemi segnalati dalla pubblicazione.

Vedi anche le traduzioni .


Astratto

L'accessibilità dei contenuti web richiede informazioni semantiche su widget, strutture e comportamenti, al fine di consentire alle tecnologie assistive di trasmettere informazioni appropriate alle persone con disabilità. Questa specifica fornisce un'ontologia di ruoli, stati e proprietà che definiscono elementi di interfaccia utente accessibili e possono essere utilizzati per migliorare l'accessibilità e l'interoperabilità di contenuti e applicazioni web. Queste semantiche sono progettate per consentire all'autore di trasmettere correttamente i comportamenti dell'interfaccia utente e le informazioni strutturali alle tecnologie assistive nel markup a livello di documento. Questa versione aggiunge nuove funzionalità rispetto a WAI-ARIA 1.0 [ wai-aria-1.0 ] per migliorare l'interoperabilità con le tecnologie assistive per formare un modello di accessibilità più coerente per [ html5 ] e [ SVG2 ]. Questa specifica completa sia [ html5 ] che [ SVG2 ].

Questo documento fa parte della suite WAI-ARIA descritta nella panoramica WAI-ARIA .

Stato di questo documento

Questa sezione descrive lo stato di questo documento al momento della sua pubblicazione. Altri documenti possono sostituire questo documento. Un elenco delle attuali pubblicazioni del W3C e l'ultima revisione di questo rapporto tecnico sono disponibili nell'indice dei rapporti tecnici del W3C su https://www.w3.org/TR/.

Questa è la raccomandazione W3C WAI-ARIA 1.1 del gruppo di lavoro sulle applicazioni Internet accessibili . Il gruppo di lavoro ha creato un report di implementazione di WAI-ARIA 1.1 per dimostrare che la specifica è implementabile. Una cronologia delle modifiche a WAI-ARIA 1.1 è disponibile nell'appendice.

Per commentare questo documento, presenta un problema nel repository GitHub di W3C aria . Se questo non è possibile, invia un'email a ( archivio dei commenti ). I commenti ricevuti sulla Raccomandazione WAI-ARIA 1.1 non possono comportare modifiche a questa versione della specifica, ma possono essere risolti in errata o versioni future di WAI-ARIA . Il gruppo di lavoro non può formulare risposte formali ai commenti, ma i lavori futuri intrapresi dal gruppo di lavoro possono riguardare i commenti ricevuti su questo documento. Gli aggiornamenti in corso alla tecnologia possono essere visualizzati nella bozza degli editor pubblicamente visibili .

Questo documento è stato pubblicato dal gruppo di lavoro Accessible Rich Internet Applications come una raccomandazione.

Si prega di consultare il rapporto di implementazione del gruppo di lavoro.

Questo documento è stato esaminato dai membri del W3C , dagli sviluppatori di software e da altri gruppi W3C e parti interessate ed è approvato dal Direttore come una Raccomandazione W3C . È un documento stabile e può essere utilizzato come materiale di riferimento o citato da un altro documento. Il ruolo del W3C nel formulare la Raccomandazione è attirare l'attenzione sulle specifiche e promuovere la sua diffusione su larga scala. Ciò migliora la funzionalità e l'interoperabilità del Web.

Questo documento è stato prodotto da un gruppo che opera nell'ambito della politica sui brevetti del W3C . W3C mantiene un elenco pubblico di tutte le informazioni sui brevetti fatte in relazione ai deliverable del gruppo; quella pagina include anche le istruzioni per divulgare un brevetto. Un individuo che abbia una conoscenza effettiva di un brevetto che l'individuo crede contenga una o più rivendicazioni essenziali deve divulgare le informazioni in conformità con la sezione 6 della Politica sui brevetti del W3C .

Questo documento è disciplinato dal Documento di processo W3C del 1 ° marzo 2017 .

1. Introduzione §

Questa sezione non è normativa.

Gli obiettivi di questa specifica includono:

  • espandere le informazioni sull'accessibilità che possono essere fornite dall'autore;
  • richiedendo che le lingue host di supporto forniscano il supporto completo della tastiera che può essere implementato in modo indipendente dal dispositivo, ad esempio telefoni, dispositivi palmari, lettori di e-book e televisori;
  • migliorare l'accessibilità del contenuto dinamico generato dagli script; e
  • fornitura di interoperabilità con tecnologie assistive .

WAI-ARIA è una specifica tecnica che fornisce una struttura per migliorare l'accessibilità e l'interoperabilità di contenuti e applicazioni web. Questo documento è principalmente destinato agli sviluppatori che creano widget personalizzati e altri componenti delle applicazioni Web. Si prega di consultare la panoramica WAI-ARIA per i collegamenti ai documenti correlati per altri tipi di pubblico, come le Pratiche di authoring WAI-ARIA [ wai-aria-practices-1.1 ] che introducono gli sviluppatori ai problemi di accessibilità che WAI-ARIA intende risolvere, la fondamentale concetti e l'approccio tecnico di WAI-ARIA .

Questa bozza attualmente gestisce due aspetti dei ruoli : funzionalità dell'interfaccia utente e relazioni strutturali. Per ulteriori informazioni e casi d'uso, consultare [ wai-aria-practices-1.1 ] per l'utilizzo dei ruoli nel rendere accessibile il contenuto interattivo.

La tassonomia del ruolo è stata progettata in parte per supportare i ruoli comuni trovati nelle API di accessibilità della piattaforma. Il riferimento ai ruoli trovati in questa tassonomia da contenuti web dinamici può essere usato per supportare l'interoperabilità con le tecnologie assistive.

Lo schema per supportare questo standard è stato progettato per essere estensibile in modo che i ruoli personalizzati possano essere creati estendendo i ruoli di base. Ciò consente agli agenti utente di supportare almeno il ruolo di base e gli agenti utente che supportano il ruolo personalizzato possono fornire accesso migliorato. Nota che molto di ciò potrebbe essere formalizzato in [ xmlschema-2 ]. Tuttavia, essere in grado di definire somiglianze tra ruoli, come baseConcepts e definizioni più descrittive, non sarebbe disponibile in XSD .

WAI-ARIA 1.1 è un membro della suite WAI-ARIA 1.1 che definisce come esporre la semantica di WAI-ARIA e altri linguaggi del contenuto Web alle API di accessibilità .

1.1 Accessibilità Rich Internet Application §

Il dominio dell'accessibilità web definisce come rendere i contenuti web utilizzabili da persone con disabilità. Le persone con determinati tipi di disabilità utilizzano le tecnologie assistive ( AT ) per interagire con i contenuti. Le tecnologie assistive possono trasformare la presentazione del contenuto in un formato più adatto all'utente e possono consentire all'utente di interagire in modi diversi. Ad esempio, potrebbe essere necessario, o scegliere, l'interazione con un widget di scorrimento tramite i tasti freccia, invece di trascinare e rilasciare con il mouse. Per raggiungere questo obiettivo in modo efficace, il software deve comprendere la semantica del contenuto. La semantica è la scienza del significato; in questo caso, usato per assegnare ruoli, stati e proprietà che si applicano all'interfaccia utente e agli elementi di contenuto come un essere umano capirebbe. Ad esempio, se un paragrafo è identificato semanticamente come tale, le tecnologie assistive possono interagire con esso come un'unità separabile dal resto del contenuto, conoscendo i confini esatti di quel paragrafo. Un cursore di intervallo regolabile o elenco comprimibile (ovvero un widget dell'albero) sono esempi più complessi, in cui varie parti del widget hanno una semantica che deve essere identificata correttamente per le tecnologie assistive per supportare l'interazione efficace.

Le nuove tecnologie spesso trascurano la semantica richiesta per l'accessibilità e le nuove pratiche di authoring spesso utilizzano in modo improprio la semantica prevista di tali tecnologie. Gli elementi che hanno un significato definito nella lingua sono usati con un significato diverso inteso per essere compreso dall'utente.

For example, web application developers create collapsible tree widgets in HTML using CSS and JavaScript even though HTML has no semantic tree element. To a non-disabled user, it may look and act like a collapsible tree widget, but without appropriate semantics, the tree widget may not be perceivable to, or operable by, a person with a disability because assistive technologies may not recognize the role. Similarly, web application developers create interactive button widgets in SVG using JavaScript even though SVG has no semantic button element. To a non-disabled user, it may look and act like a button widget, but without appropriate semantics, the button widget may not be perceivable to, or operable by, a person with a disability because assistive technologies may not recognize the role.

The incorporation of WAI-ARIA is a way for an author to provide proper semantics for custom widgets to make these widgets accessible, usable, and interoperable with assistive technologies. This specification identifies the types of widgets and structures that are commonly recognized by accessibility products, by providing an ontology of corresponding roles that can be attached to content. This allows elements with a given role to be understood as a particular widget or structural type regardless of any semantics inherited from the implementing host language. Roles are a common property of platform accessibility APIs which assistive technologies use to provide the user with effective presentation and interaction.

This role taxonomy includes interaction widgets and elements denoting document structure. The role taxonomy describes inheritance and details the attributes each role supports. Information about mapping of roles to accessibility APIs is provided by the Core Accessibility API Mappings 1.1 [core-aam-1.1].

Roles are element types and will not change with time or user actions. Role information is used by assistive technologies, through interaction with the user agent, to provide normal processing of the specified element type.

States and properties are used to declare important attributes of an element that affect and describe interaction. They enable the user agent and operating system to properly handle the element even when the attributes are dynamically changed by client-side scripts. For example, alternative input and output technology, such as screen readers and speech dictation software, need to be able to recognize and effectively manipulate and communicate various interaction states (e.g., disabled, checked) to the user.

While it is possible for assistive technologies to access these properties directly through the Document Object Model [dom], the preferred mechanism is for the user agent to map the states and properties to the accessibility API of the operating system. See the Core Accessibility API Mappings 1.1 [core-aam-1.1] and the Accessible Name and Description: Computation and API Mappings 1.1 [accname-aam-1.1] for details.

Figure 1.0 illustrates the relationship between user agents (e.g., browsers), accessibility APIs, and assistive technologies. It describes the "contract" provided by the user agent to assistive technologies, which includes typical accessibility information found in the accessibility API for many of our accessible platforms for GUIs (role, state, selection, event notification, relationship information, and descriptions). The DOM, usually HTML, acts as the data model and view in a typical model-view-controller relationship, and JavaScript acts as the controller by manipulating the style and content of the displayed data. The user agent conveys relevant information to the operating system's accessibility API, which can be used by any assistive technologies, such as screen readers.

Figure 1: The contract model with accessibility APIs

For more information see WAI-ARIA Authoring Practices [wai-aria-practices-1.1] for the use of roles in making interactive content accessible.

In addition to the prose documentation, the role taxonomy is provided in Web Ontology Language (OWL) [owl-features], which is expressed in Resource Description Framework (RDF) [rdf-concepts]. Tools can use these to validate the implementation of roles in a given content document. For example, instances of some roles are expected to be children of a specific parent role. Also, some roles may support a specific state or property that another role does not support.

Note

The use of RDF/OWL as a formal representation of roles may be used to support future extensibility. Standard RDF/OWL mechanisms can be used to define new roles that inherit from the roles defined in this specification. The mechanism to define and use role extensions in an interoperable manner, however, is not defined by this specification, and RDF/OWL processing is not essential to interoperable implementation of this specification. A future version of WAI-ARIA is expected to define how to extend roles.

Users of alternate input devices need keyboard accessible content. The new semantics, when combined with the recommended keyboard interactions provided in WAI-ARIA Authoring Practices [wai-aria-practices-1.1], will allow alternate input solutions to facilitate command and control via an alternate input solution.

WAI-ARIA introduces navigational landmarks through its taxonomy and the XHTML role landmarks, which can help persons with dexterity and vision impairments by providing for improved keyboard navigation. WAI-ARIA may also be used to assist persons with cognitive learning disabilities. The additional semantics allow authors to restructure and substitute alternative content as needed.

Assistive technologies need the ability to support alternative inputs by getting and setting the current value of widget states and properties. Assistive technologies also need to determine what objects are selected and manage widgets that allow multiple selections, such as list boxes and grids.

Speech-based command and control systems can benefit from WAI-ARIA semantics like the role attribute to assist in conveying audio information to the user. For example, upon encountering an element with a role of menu with child elements of role menuitem each containing text content representing a different flavor, a speech system might state to the user, "Select one of three choices: chocolate, strawberry, or vanilla."

WAI-ARIA is intended to be used as a supplement for native language semantics, not a replacement. When the host language provides a feature that provides equivalent accessibility to the WAI-ARIA feature, use the host language feature. WAI-ARIA should only be used in cases where the host language lacks the needed role, state, and property indicators. Use a host language feature that is as similar as possible to the WAI-ARIA feature, then refine the meaning by adding WAI-ARIA. For instance, a multi-selectable grid could be implemented as a table, and then WAI-ARIA used to clarify that it is an interactive grid, not just a static data table. This allows for the best possible fallback for user agents that do not support WAI-ARIA and preserves the integrity of the host language semantics.

1.2 Target Audience§

This specification defines the basic model for WAI-ARIA, including roles, states, properties, and values. It impacts several audiences:

  • User agents that process content containing WAI-ARIA features;
  • Assistive technologies that present content in special ways to user with disabilities;
  • Authors who create content;
  • Authoring tools that help authors create conforming content; and
  • Conformance checkers that verify appropriate use of WAI-ARIA.

Each conformance requirement indicates the audience to which it applies.

Although this specification is applicable to the above audiences, it is not specifically targeted to, nor is it intended to be the sole source of information for, any of these audiences. The following documents provide important supporting information:

1.3 User Agent Support§

WAI-ARIA relies on user agent support for its features in two ways:

Aside from using WAI-ARIA markup to improve what is exposed to accessibility APIs, user agents behave as they would natively. Assistive technologies react to the extra information in the accessibility API as they already do for the same information on non-web content. User agents that are not assistive technologies, however, need do nothing beyond providing appropriate updates to the accessibility API.

The WAI-ARIA specification neither requires nor forbids user agents from enhancing native presentation and interaction behaviors on the basis of WAI-ARIA markup. Mainstream user agents might expose WAI-ARIA navigational landmarks (for example, as a dialog box or through a keyboard command) with the intention to facilitate navigation for all users. User agents are encouraged to maximize their usefulness to users, including users without disabilities.

WAI-ARIA is intended to provide missing semantics so that the intent of the author may be conveyed to assistive technologies. Generally, authors using WAI-ARIA will provide the appropriate presentation and interaction features. Over time, host languages may add WAI-ARIA equivalents, such as new form controls, that are implemented as standard accessible user interface controls by the user agent. This allows authors to use them instead of custom WAI-ARIA enabled user interface components. In this case the user agent would support the native host language feature. Developers of host languages that implement WAI-ARIA are advised to continue supporting WAI-ARIA semantics when they do not adversely conflict with implicit host language semantics, as WAI-ARIA semantics more clearly reflect the intent of the author if the host language features are inadequate to meet the author's needs.

1.4 Co-Evolution of WAI-ARIA and Host Languages§

WAI-ARIA is intended to augment semantics in supporting languages like [html5] and [SVG2], or to be used as an accessibility enhancement technology in other markup-based languages that do not explicitly include support for ARIA. It clarifies semantics to assistive technologies when authors create new types of objects, via style and script, that are not yet directly supported by the language of the page, because the invention of new types of objects is faster than standardized support for them appears in web languages.

It is not appropriate to create objects with style and script when the host language provides a semantic element for that type of object. While WAI-ARIA can improve the accessibility of these objects, accessibility is best provided by allowing the user agent to handle the object natively. For example, it's better to use an h1 element in HTML than to use the heading role on a div element.

It is expected that, over time, host languages will evolve to provide semantics for objects that currently can only be declared with WAI-ARIA. This is natural and desirable, as one goal of WAI-ARIA is to help stimulate the emergence of more semantic and accessible markup. When native semantics for a given feature become available, it is appropriate for authors to use the native feature and stop using WAI-ARIA for that feature. Legacy content may continue to use WAI-ARIA, however, so the need for user agents to support WAI-ARIA remains.

While specific features of WAI-ARIA may lose importance over time, the general possibility of WAI-ARIA to add semantics to web pages is expected to be a persistent need. Host languages may not implement all the semantics WAI-ARIA provides, and various host languages may implement different subsets of the features. New types of objects are continually being developed, and one goal of WAI-ARIA is to provide a way to make such objects accessible, because web authoring practices often advance faster than host language standards. In this way, WAI-ARIA and host languages both evolve together but at different rates.

Some host languages exist to create semantics for features other than the user interface. For example, SVG expresses the semantics behind production of graphical objects, not of user interface components that those objects may represent; XForms provides semantics for form controls and does not provide wider user interface features. Host languages such as these might, by design, not provide native semantics that map to WAI-ARIA features. In these cases, WAI-ARIA could be adopted as a long-term approach to add semantic information to user interface components.

1.5 Authoring Practices§

1.5.1 Authoring Tools§

Many of the requirements in the definitions of WAI-ARIA roles, states, and properties can be checked automatically during the development process, similar to other quality control processes used for validating code. To assist authors who are creating custom widgets, authoring tools may compare widget roles, states, and properties to those supported in WAI-ARIA as well as those supported in related and cross-referenced roles, states, and properties. Authoring tools may notify authors of errors in widget design patterns, and may also prompt developers for information that cannot be determined from context alone. For example, a scripting library can determine the labels for the tree items in a tree view, but would need to prompt the author to label the entire tree. To help authors visualize a logical accessibility structure, an authoring environment might provide an outline view of a web resource based on the WAI-ARIA markup.

In both HTML and SVG, tabindex is an important way browsers support keyboard focus navigation for implementations of WAI-ARIA; authoring and debugging tools may check to make sure tabindex values are properly set. For example, error conditions may include cases where more than one treeitem in a tree has a tabindex value greater than or equal to 0, where tabindex is not set on any treeitem, or where aria-activedescendant is not defined when the element with the role tree has a tabindex value of greater than or equal to 0.

1.5.2 Testing Practices and Tools§

The accessibility of interactive content cannot be confirmed by static checks alone. Developers of interactive content should test for device-independent access to widgets and applications, and should verify accessibility API access to all content and changes during user interaction.

1.6 Assistive Technologies§

Programmatic access to accessibility semantics is essential for assistive technologies. Most assistive technologies interact with user agents, like other applications, through a recognized accessibility API. Perceivable objects in the user interface are exposed to assistive technologies as accessible objects, defined by the accessibility API interfaces. To do this properly, accessibility information – role, states, properties as well as contextual information – needs to be accurately conveyed to the assistive technologies through the accessibility API. When a state change occurs, the user agent provides the appropriate event notification to the accessibility API. Contextual information, in many host languages like HTML, can be determined from the DOM itself as it provides a contextual tree hierarchy.

While some assistive technologies interact with these accessibility APIs, others may access the content directly from the DOM. These technologies can restructure, simplify, style, or reflow the content to help a different set of users. Common use cases for these types of adaptations may be the aging population, persons with cognitive impairments, or persons in environments that interfere with use of their tools. For example, the availability of regional navigational landmarks may allow for a mobile device adaptation that shows only portions of the content at any one time based on its semantics. This could reduce the amount of information the user needs to process at any one time. In other situations it may be appropriate to replace a custom user interface control with something that is easier to navigate with a keyboard, or touch screen device.

2. Using WAI-ARIA§

This section is non-normative.

Complex web applications become inaccessible when assistive technologies cannot determine the semantics behind portions of a document or when the user is unable to effectively navigate to all parts of it in a usable way (see WAI-ARIA Authoring Practices [wai-aria-practices-1.1]). WAI-ARIA divides the semantics into roles (the type defining a user interface element) and states and properties supported by the roles.

Authors need to associate elements in the document to a WAI-ARIA role and the appropriate states and properties (aria-* attributes) during its life-cycle, unless the elements already have the appropriate implicit WAI-ARIA semantics for states and properties. In these instances the equivalent host language states and properties take precedence to avoid a conflict while the role attribute will take precedence over the implicit role of the host language element.

2.1 WAI-ARIA Roles§

A WAI-ARIA role is set on an element using a role attribute, similar to the role attribute defined in Role Attribute [role-attribute].

Example 1
<li role="menuitem">Open file…</li>

The roles defined in this specification include a collection of document landmarks and the WAI-ARIA role taxonomy.

The roles in this taxonomy and their expected behaviors are modeled using RDF/OWL [owl-features]. Features of the role taxonomy provide the following information for each role:

  • an informative description of the role;
  • hierarchical information about related roles (e.g., a directory is a type of list);
  • context of the role (e.g., a listitem is contained inside a list);
  • references to related concepts in other specifications;
  • use of OWL to provide a type hierarchy allowing for semantic inheritance (similar to a class hierarchy); and
  • supported states and properties for each role (e.g., a checkbox supports being checked via aria-checked).

Attaching a role gives assistive technologies information about how to handle each element.

2.2 WAI-ARIA States and Properties§

WAI-ARIA provides a collection of accessibility states and properties which are used to support platform accessibility APIs on various operating system platforms. Assistive technologies may access this information through an exposed user agent DOM or through a mapping to the platform accessibility API. When combined with roles, the user agent can supply the assistive technologies with user interface information to convey to the user at any time. Changes in states or properties will result in a notification to assistive technologies, which could alert the user that a change has occurred.

In the following example, a list item (html:li) has been used to create a checkable menu item, and JavaScript events will capture mouse and keyboard events to toggle the value of aria-checked. A role is used to make the behavior of this simple widget known to the user agent. Attributes that change with user actions (such as aria-checked) are defined in the states and properties section.

Example 2
<li role="menuitemcheckbox" aria-checked="true">Sort by Last Modified</li>

Some accessibility states, called managed states, are controlled by the user agent. Examples of managed state include keyboard focus and selection. Managed states often have corresponding CSS pseudo-classes (such as :focus and ::selection) to define style changes. In contrast, the states in this specification are typically controlled by the author and are called unmanaged states. Some states are managed by the user agent, such as aria-posinset and aria-setsize, but the author can override them if the DOM is incomplete and would cause the user agent calculation to be incorrect. User agents map both managed and unmanaged states to the platform accessibility APIs.

Most modern user agents support CSS attribute selectors ([css3-selectors]), and can allow the author to create UI changes based on WAI-ARIA attribute information, reducing the amount of scripts necessary to achieve equivalent functionality. In the following example, a CSS selector is used to determine whether or not the text is bold and an image of a check mark is shown, based on the value of the aria-checked attribute.

Example 3
[aria-checked="true"] { font-weight: bold; }
[aria-checked="true"]::before { background-image: url(checked.gif); }

If CSS is not used to toggle the visual representation of the check mark, the author could include additional markup and scripts to manage an image that represents whether or not the menuitemcheckbox is checked.

Example 4
<li role="menuitemcheckbox" aria-checked="true">
  <img src="checked.gif" role="presentation" alt="">
  <!-- note: additional scripts required to toggle image source -->
  Sort by Last Modified
</li>

2.3 Managing Focus§

An application should always have an element with focus when in use, as applications require users to have a place to provide user input. Authors are advised to not destroy the element with focus or scroll it off-screen unless through user intervention. All interactive objects should be focusable. All parts of composite interactive controls need to be focusable or have a documented alternative method to achieve their function, such as a keyboard shortcut. Authors are advised to maintain an obvious, discoverable way, either through tabbing or other standard navigation techniques, for keyboard users to move the focus to any interactive element. See User Agent Accessibility Guidelines, Guideline 9 ([UAAG10], Guideline 9).

When using standard HTML and basic WAI-ARIA widgets, application developers can simply manipulate the tab order or use a script to create keyboard shortcuts to elements in the document. Use of more complex widgets requires the author to manage focus within them. SVG Tiny provides a similar navigation "ring" mechanism that by default follows document order and which should be implemented using system dependent input facilities (the TAB key on most desktop computers). SVG authors may place elements in the navigation order by manipulating the focusable attribute and they may dynamically specify the navigation order by modifying elements' navigation attributes.

WAI-ARIA includes a number of "managing container" widgets, also known as "composite" widgets. When appropriate, the container is responsible for tracking the last descendant that was active (the default is usually the first item in the container). It is essential that a container maintain a usable and consistent strategy when focus leaves a container and is then later refocused. While there may be exceptions, it is recommended that when a previously focused container is refocused, the active descendant be the same element as the active descendant when the container was last focused. Exceptions include cases where the contents of a container widget have changed, and widgets like a menubar where the user expects to always return to the first item when focus leaves the menu bar. For example, if the second item of a tree group was the active descendant when the user tabbed out of the tree group, then the second item of the tree group remains the active descendant when the tree group gets focus again. The user may also activate the container by clicking on one of the descendants within it.

When the container or its active descendant has focus, the user may navigate through the container by pressing additional keys, such as the arrow keys, to change the currently active descendant. Any additional press of the main navigation key (generally the TAB key) will move out of the container to the next widget.

For example, a grid may be used as a spreadsheet with thousands of gridcell elements, all of which may not be present in the document at one time. This requires focus to be managed by the container using the aria-activedescendant attribute on the managing container element, or by the container managing the tabindex of its child elements and setting focus on the appropriate child.

Content authors are required to manage focus on the following container roles:

More information on managing focus can be found in the Developing a Keyboard Interface section of the WAI-ARIA Authoring Practices [wai-aria-practices-1.1].

3. Conformance§

As well as sections marked as non-normative, all authoring guidelines, diagrams, examples, and notes in this specification are non-normative. Everything else in this specification is normative.

The key words MAY, MUST, MUST NOT, SHOULD, and SHOULD NOT are to be interpreted as described in [RFC2119].

This specification indicates whether a section is normative or informative. Classifying a section as normative or informative applies to the entire section. A statement "This section is normative" or "This section is informative" applies to all sub-sections of that section.

Normative sections provide requirements that authors, user agents, and assistive technologies MUST follow for an implementation to conform to this specification.

Informative sections provide information useful to understanding the specification. Such sections may contain examples of recommended practice, but it is not required to follow such recommendations in order to conform to this specification.

3.1 Non-interference with the Host Language§

WAI-ARIA processing by the user agent MUST NOT interfere with the normal operation of the built-in features of the host language.

If a CSS selector includes a WAI-ARIA attribute (e.g., input[aria-invalid="true"]), user agents MUST update the visual display of any elements matching (or no longer matching) the selector any time the attribute is added/changed/removed in the DOM. The user agent MAY alter the mapping of the host language features into an accessibility API, but the user agent MUST NOT alter the DOM in order to remap WAI-ARIA markup into host language features.

3.2 All WAI-ARIA in DOM§

A conforming user agent which implements a document object model that does not conform to the W3C DOM specification MUST include the content attribute for role and its WAI-ARIA role values, as well as the WAI-ARIA States and Properties in the DOM as specified by the author, even though processing may affect how the elements are exposed to accessibility APIs. Doing so ensures that each role attribute and all WAI-ARIA states and properties, including their values, are in the document in an unmodified form so other tools, such as assistive technologies, can access them. A conforming W3C DOM meets this criterion.

3.3 Assistive Technology Notifications Communicated to Web Applications§

Assistive technologies, such as speech recognition systems and alternate input devices for users with mobility impairments, require the ability to control a web application in a device-independent way. WAI-ARIA states and properties reflect the current state of rich internet application components. The ability for assistive technologies to notify web applications of necessary changes is essential because it allows these alternative input solutions to control an application without being dependent on the standard input device which the user is unable to effectively control directly.

User agents MUST provide a method to notify the web application when a change occurs to states or properties in the system accessibility API. Likewise, web application authors SHOULD update the web application accordingly when notified of a change request from the user agent or assistive technology.

Note

Many state and properties can be changed by assistive technologies through existing accessibility APIs by responding to a default action event. For example, the aria-selected state of a tab in a tabpanel can be changed by triggering the default action on the element.

3.4 Conformance Checkers§

Any application or script verifying document conformance or validity SHOULD include a test for all of the normative author requirements in this specification. If testing for a given requirement, conformance checkers MUST issue an error if an author "MUST" requirement isn't met, and MUST issue a warning if an author "SHOULD" requirement isn't met.

3.5 Deprecated Requirements§

As the technology evolves, sometimes new ways to meet a use case become available, that work better than a feature that was previously defined. But because of existing implementation of the older feature, that feature cannot be removed from the conformance model without rendering formerly conforming content non-conforming. In this case, the older feature is marked as "deprecated". This indicates that the feature is allowed in the conformance model and expected to be supported by user agents, but it is recommended that authors do not use it for new content. In future versions of the specification, if the feature is no longer widely used, the feature could be removed and no longer expected to be supported by user agents.

4. Important Terms§

This section is non-normative.

While some terms are defined in place, the following definitions are used throughout this document.

Accessibility API

Operating systems and other platforms provide a set of interfaces that expose information about objects and events to assistive technologies. Assistive technologies use these interfaces to get information about and interact with those widgets. Examples of accessibility APIs are Microsoft Active Accessibility [MSAA], Microsoft User Interface Automation [UI-AUTOMATION], MSAA with UIA Express [UIA-EXPRESS], the Mac OS X Accessibility Protocol [AXAPI], the Linux/Unix Accessibility Toolkit [ATK] and Assistive Technology Service Provider Interface [AT-SPI], and IAccessible2 [IAccessible2].

Accessible Description

An accessible description provides additional information, related to an interface element, that complements the accessible name. The accessible description might or might not be visually perceivable.

Accessible Name

The accessible name is the name of a user interface element. Each platform accessibility API provides the accessible name property. The value of the accessible name may be derived from a visible (e.g., the visible text on a button) or invisible (e.g., the text alternative that describes an icon) property of the user interface element. See related accessible description.

A simple use for the accessible name property may be illustrated by an "OK" button. The text "OK" is the accessible name. When the button receives focus, assistive technologies may concatenate the platform's role description with the accessible name. For example, a screen reader may speak "push-button OK" or "OK button". The order of concatenation and specifics of the role description (e.g., "button", "push-button", "clickable button") are determined by platform accessibility APIs or assistive technologies.

Assistive Technologies

Hardware and/or software that:

  • relies on services provided by a user agent to retrieve and render Web content
  • works with a user agent or web content itself through the use of APIs, and
  • provides services beyond those offered by the user agent to facilitate user interaction with web content by people with disabilities

This definition may differ from that used in other documents.

Examples of assistive technologies that are important in the context of this document include the following:

  • screen magnifiers, which are used to enlarge and improve the visual readability of rendered text and images;
  • screen readers, which are most-often used to convey information through synthesized speech or a refreshable Braille display;
  • text-to-speech software, which is used to convert text into synthetic speech;
  • speech recognition software, which is used to allow spoken control and dictation;
  • alternate input technologies (including head pointers, on-screen keyboards, single switches, and sip/puff devices), which are used to simulate the keyboard;
  • alternate pointing devices, which are used to simulate mouse pointing and clicking.
Attribute

In this specification, attribute is used as it is in markup languages. Attributes are structural features added to elements to provide information about the states and properties of the object represented by the element.

Class

A set of instance objects that share similar characteristics.

Deprecated

A deprecated role, state, or property is one which has been outdated by newer constructs or changed circumstances, and which may be removed in future versions of the WAI-ARIA specification. User agents are encouraged to continue to support items identified as deprecated for backward compatibility. For more information, see Deprecated Requirements in the Conformance section.

Element

In this specification, element is used as it is in markup languages. Elements are the structural elements in markup language that contains the data profile for objects.

Event

A programmatic message used to communicate discrete changes in the state of an object to other objects in a computational system. User input to a web page is commonly mediated through abstract events that describe the interaction and can provide notice of changes to the state of a document object. In some programming languages, events are more commonly known as notifications.

Graphical Document

A document containing graphic representations with user-navigable parts. Charts, maps, diagrams, blueprints, and dashboards are examples of graphical documents. A graphical document is composed using any combination of symbols, images, text, and graphic primitives (shapes such as circles, points, lines, paths, rectangles, etc).

Hidden

Indicates that the element is not visible, perceivable, or interactive to any user. An element is considered hidden if it or any one of its ancestor elements is not rendered or is explicitly hidden.

Informative

Content provided for information purposes and not required for conformance. Content required for conformance is referred to as normative.

Keyboard Accessible

Accessible to the user using a keyboard or assistive technologies that mimic keyboard input, such as a sip and puff tube. References in this document relate to WCAG 2.0 Guideline 2.1: Make all functionality available from a keyboard [WCAG20].

Landmark

A type of region on a page to which the user may want quick access. Content in such a region is different from that of other regions on the page and relevant to a specific user purpose, such as navigating, searching, perusing the primary content, etc.

Live Region

Live regions are perceivable regions of a web page that are typically updated as a result of an external event when user focus may be elsewhere. These regions are not always updated as a result of a user interaction. This practice has become commonplace with the growing use of Ajax. Examples of live regions include a chat log, stock ticker, or a sport scoring section that updates periodically to reflect game statistics. Since these asynchronous areas are expected to update outside the user's area of focus, assistive technologies such as screen readers have either been unaware of their existence or unable to process them for the user. WAI-ARIA has provided a collection of properties that allow the author to identify these live regions and process them: aria-live, aria-relevant, aria-atomic, and aria-busy.

Managed State

Accessibility API state that is controlled by the user agent, such as focus and selection. These are contrasted with "unmanaged states" that are typically controlled by the author. Nevertheless, authors can override some managed states, such as aria-posinset and aria-setsize. Many managed states have corresponding CSS pseudo-classes, such as :focus, and pseudo-elements, such as ::selection, that are also updated by the user agent.

Nemeth Braille

The Nemeth Braille Code for Mathematics is a braille code for encoding mathematical and scientific notation. See Nemeth Braille on Wikipedia.

Normative

Required for conformance. By contrast, content identified as informative or "non-normative" is not required for conformance.

Object

In the context of user interfaces, an item in the perceptual user experience, represented in markup languages by one or more elements, and rendered by user agents.

In the context of programming, the instantiation of one or more classes and interfaces which define the general characteristics of similar objects. An object in an accessibility API may represent one or more DOM objects. Accessibility APIs have defined interfaces that are distinct from DOM interfaces.
Ontology

A description of the characteristics of classes and how they relate to each other.

Operable

Usable by users in ways they can control. References in this document relate to WCAG 2.0 Principle 2: Content must be operable [WCAG20]. See Keyboard Accessible.

Owned Element

An 'owned element' is any DOM descendant of the element, any element specified as a child via aria-owns, or any DOM descendant of the owned child.

Perceivable

Presentable to users in ways they can sense. References in this document relate to WCAG 2.0 Principle 1: Content must be perceivable [WCAG20].

Property

Attributes that are essential to the nature of a given object, or that represent a data value associated with the object. A change of a property may significantly impact the meaning or presentation of an object. Certain properties (for example, aria-multiline) are less likely to change than states, but note that the frequency of change difference is not a rule. A few properties, such as aria-activedescendant, aria-valuenow, and aria-valuetext are expected to change often. See clarification of states versus properties.

Relationship

A connection between two distinct things. Relationships may be of various types to indicate which object labels another, controls another, etc.

Role

Main indicator of type. This semantic association allows tools to present and support interaction with the object in a manner that is consistent with user expectations about other objects of that type.

Semantics

The meaning of something as understood by a human, defined in a way that computers can process a representation of an object, such as elements and attributes, and reliably represent the object in a way that various humans will achieve a mutually consistent understanding of the object.

State

A state is a dynamic property expressing characteristics of an object that may change in response to user action or automated processes. States do not affect the essential nature of the object, but represent data associated with the object or user interaction possibilities. See clarification of states versus properties.

Taxonomy

A hierarchical definition of how the characteristics of various classes relate to each other, in which classes inherit the properties of superclasses in the hierarchy. A taxonomy can comprise part of the formal definition of an ontology.

Understandable

Presentable to users in ways they can construct an appropriate meaning. References in this document relate to WCAG 2.0 Principle 3: Information and the operation of user interface must be understandable [WCAG20].

User Agent

Any software that retrieves, renders and facilitates end user interaction with Web content. This definition may differ from that used in other documents.

Widget

Discrete user interface object with which the user can interact. Widgets range from simple objects that have one value or operation (e.g., check boxes and menu items), to complex objects that contain many managed sub-objects (e.g., trees and grids).

5. The Roles Model§

This section defines the WAI-ARIA role taxonomy and describes the characteristics and properties of all roles. A formal RDF/OWL representation of all the information presented here is available in Schemata Appendix.

The roles, their characteristics, the states and properties they support, and specification of how they may be used in markup, shall be considered normative. The RDF/OWL representation used to model the taxonomy shall be considered informative. The RDF/OWL taxonomy may be used as a vehicle to extend WAI-ARIA in the future or by tool manufacturers to validate states and properties applicable to roles per this specification.

Roles are element types and authors MUST NOT change role values over time or with user actions. Authors wishing to change a role MUST do so by deleting the associated element and its children and replacing it with a new element with the appropriate role. Typically, platform accessibility APIs do not provide a vehicle to notify assistive technologies of a role value change, and consequently, assistive technologies may not update their cache with the new role attribute value.

In order to reflect the content in the DOM, user agents SHOULD map the role attribute to the appropriate value in the implemented accessibility API, and user agents SHOULD update the mapping when the role attribute changes.

5.1 Relationships Between Concepts§

The role taxonomy uses the following relationships to relate WAI-ARIA roles to each other and to concepts from other specifications, such as HTML and XForms.

5.1.1 Superclass Role§

Inheritance is expressed in RDF using the RDF Schema 1.1 subClassOf ([rdf-schema]) property.

RDF Property
rdfs:subClassOf

The role that the current subclassed role extends in the taxonomy. This extension causes all the properties and constraints of the superclass role to propagate to the subclass role. Other than well known stable specifications, inheritance may be restricted to items defined inside this specification, so that external items cannot be changed and affect inherited classes.

5.1.2 Subclass Roles§

RDF Property
<none>

Informative list of roles for which this role is the superclass. This is provided to facilitate reading of the specification but adds no new information.

RDF Property
role:relatedConcept

Informative data about a similar or related idea from other specifications. Concepts that are related are not necessarily identical. Related concepts do not inherit properties from each other. Hence if the definition of one concept changes, the properties, behavior, and definition of its related concept is not affected.

For example, a progress bar is like a status indicator. Therefore, the progressbar widget has a relatedConcept value which includes status. However, if the definition of status is modified, the definition of a progressbar is not affected.

5.1.4 Base Concept§

RDF Property
role:baseConcept

Informative data about objects that are considered prototypes for the role. Base concept is similar to type, but without inheritance of limitations and properties. Base concepts are designed as a substitute for inheritance for external concepts. A base concept is like a related concept except that the base concept is almost identical to the role definition.

For example, the checkbox defined in this document has similar functionality and anticipated behavior to a checkbox defined in HTML. Therefore, a checkbox has an HTML checkbox as a baseConcept. However, if the original HTML checkbox baseConcept definition is modified, the definition of a checkbox in this document will not be affected, because there is no actual inheritance of the respective type.

5.2 Characteristics of Roles§

Roles are defined and described by their characteristics. Characteristics define the structural function of a role, such as what a role is, concepts behind it, and what instances the role can or must contain. In the case of widgets this also includes how it interacts with the user agent based on mapping to HTML forms and XForms. States and properties from WAI-ARIA that are supported by the role are also indicated.

The roles taxonomy defines the following characteristics. These characteristics are implemented in RDF as properties of the OWL classes that describe the roles.

5.2.1 Abstract Roles§

RDF Property
N/A
Values
Boolean

Abstract roles are the foundation upon which all other WAI-ARIA roles are built. Content authors MUST NOT use abstract roles because they are not implemented in the API binding. User agents MUST NOT map abstract roles to the standard role mechanism of the accessibility API. Abstract roles are provided to help with the following:

  1. Organize the role taxonomy and provide roles with a meaning in the context of known concepts.
  2. Streamline the addition of roles that include necessary features.

5.2.2 Required States and Properties§

RDF Property
role:requiredState
Values
Any valid RDF object reference, such as a URI.

States and properties specifically required for the role and subclass roles. Content authors MUST provide a non-empty value for required states and properties. Content authors MUST NOT use the value undefined for required states and properties, unless undefined is an explicitly-supported value of that state or property.

When an object inherits from multiple ancestors and one ancestor indicates that property is supported while another ancestor indicates that it is required, the property is required in the inheriting object.

Note

A host language attribute with the appropriate implicit WAI-ARIA semantic fulfills this requirement.

5.2.3 Supported States and Properties§

RDF Property
role:supportedState
Values
Any valid RDF object reference, such as a URI.

States and properties specifically applicable to the role and child roles. User agents MUST map all supported states and properties for the role to an accessibility API. Content authors MAY provide values for supported states and properties, but need not in some cases where default values are sufficient.

Note

A host language attribute with the appropriate implicit WAI-ARIA semantic fulfills this requirement.

5.2.4 Inherited States and Properties§

Informative list of properties that are inherited onto a role from superclass roles. States and properties are inherited from superclass roles in the role taxonomy, not from ancestor elements in the DOM tree. These properties are not explicitly defined on the role, as the inheritance of properties is automatic. This information is provided to facilitate reading of the specification. The set of supported states and properties combined with inherited states and properties forms the full set of states and properties supported by the role.

5.2.5 Required Owned Elements§

RDF Property
role:mustContain
Values
Any valid RDF object reference, such as a URI.

Any element that will be owned by the element with this role. For example, an element with the role list will own at least one element with the role group or listitem.

When multiple roles are specified as required owned elements for a role, at least one instance of one required owned element is expected. This specification does not require an instance of each of the listed owned roles. For example, a menu should have at least one instance of a menuitem, menuitemcheckbox, or menuitemradio. The menu role does not require one instance of each.

There may be times that required owned elements are missing, for example, while editing or while loading a data set. When a widget is missing required owned elements due to script execution or loading, authors MUST mark a containing element with aria-busy equal to true. For example, until a page is fully initialized and complete, an author could mark the document element as busy.

Note

A role that has 'required owned elements' does not imply the reverse relationship. While processing of a role may be incomplete without elements of given roles present as descendants, elements with roles in this list do not always have to be found within elements of the given role. See required context role for requirements about the context where elements of a given role will be contained.

Note

An element with a subclass role of the 'required owned element' does not fulfill this requirement. For example, the list role requires ownership of an element using either the listitem or group role. Although the group role is the superclass of row, adding a owned element with a role of row will not fulfill the requirement that list must own a listitem or a group.

Note

An element with the appropriate implicit WAI-ARIA semantic fulfills this requirement.

5.2.6 Required Context Role§

RDF Property
role:scope
Values
Any valid RDF object reference, such as a URI.

The required context role defines the owning container where this role is allowed. If a role has a required context, authors MUST ensure that an element with the role is contained inside (or owned by) an element with the required context role. For example, an element with role listitem is only meaningful when contained inside (or owned by) an element with role list.

Note

A role that has 'required context role' does not imply the reverse relationship. While an element with the given role needs to appear within an element of the listed role(s) in order to be meaningful, elements of the listed roles do not always need descendant elements of the given role in order to be meaningful. See required owned elements for requirements about elements that require presence of a given descendant to be processed properly.

Note

An element with the appropriate implicit WAI-ARIA semantic fulfills this requirement.

5.2.7 Accessible Name Calculation§

RDF Property
role:nameFrom
Values
One of the following values:
  1. author: name comes from values provided by the author in explicit markup features such as the aria-label attribute, the aria-labelledby attribute, or the host language labeling mechanism, such as the alt or title attributes in HTML, with HTML title attribute having the lowest precedence for specifying a text alternative.
  2. contents: name comes from the text value of the element node. Although this may be allowed in addition to "author" in some roles, this is used in content only if higher priority "author" features are not provided. Priority is defined by the text alternative computation algorithm.
5.2.7.1 Name Computation§

Name Computation is defined in the Accessible Name and Description specification [accname-aam-1.1].

5.2.7.2 Description Computation§

Description Computation is defined in the Accessible Name and Description specification [accname-aam-1.1].

5.2.7.3 Text Alternative Computation§

Text Alternative Computation is defined in the Accessible Name and Description specification [accname-aam-1.1].

5.2.7.4 Roles Supporting Name from Author§

All roles support name from author with two exceptions. The roles that do not support name from author are presentation and none.

5.2.7.5 Roles Supporting Name from Content§

5.2.8 Presentational Children§

RDF Property
role:childrenArePresentational
Values

Boolean (true | false)

The DOM descendants are presentational. User agents SHOULD NOT expose descendants of this element through the platform accessibility API. If user agents do not hide the descendant nodes, some information may be read twice.

5.2.9 Implicit Value for Role§

Many states and properties have default values. Occasionally, the default value when used on a given role should be different from the usual default. Roles that require a state or property to have a non-standard default value indicate this in the "Implicit Value for Role". This is expressed in the form "state or property name is new default value". Roles that define this have the new default value for the state or property if the author does not provide an explicit value.

5.3 Categorization of Roles§

To support the current user scenario, this specification categorizes roles that define user interface widgets (sliders, tree controls, etc.) and those that define page structure (sections, navigation, etc.). Note that some assistive technologies provide special modes of interaction for regions marked with role application or document.

Class diagram of the relationships described in the role data model

Class diagram of the relationships described in the role data model.

SVG class diagram | PNG class diagram | Class diagram description

Roles are categorized as follows:

  1. Abstract Roles
  2. Widget Roles
  3. Document Structure Roles
  4. Landmark Roles
  5. Live Region Roles
  6. Window Roles

5.3.1 Abstract Roles§

The following roles are used to support the WAI-ARIA role taxonomy for the purpose of defining general role concepts.

Abstract roles are used for the ontology. Authors MUST NOT use abstract roles in content.

5.3.2 Widget Roles§

The following roles act as standalone user interface widgets or as part of larger, composite widgets.

The following roles act as composite user interface widgets. These roles typically act as containers that manage other, contained widgets.

5.3.3 Document Structure§

The following roles describe structures that organize content in a page. Document structures are not usually interactive.

5.3.4 Landmark Roles§

The following roles are regions of the page intended as navigational landmarks. All of these roles inherit from the landmark base type and all are imported from the Role Attribute [role-attribute]. The roles are included here in order to make them clearly part of the WAI-ARIA Role taxonomy.

5.3.5 Live Region Roles§

The following roles are live regions and may be modified by live region attributes.

5.3.6 Window Roles§

The following roles act as windows within the browser or application.

5.4 Definition of Roles§

Below is an alphabetical list of WAI-ARIA roles to be used by rich internet application authors.

Abstract roles are used for the ontology. Authors MUST NOT use abstract roles in content.

alert
A type of live region with important, and usually time-sensitive, information. See related alertdialog and status.
alertdialog
A type of dialog that contains an alert message, where initial focus goes to an element within the dialog. See related alert and dialog.
application
A structure containing one or more focusable elements requiring user input, such as keyboard or gesture events, that do not follow a standard interaction pattern supported by a widget role.
article
A section of a page that consists of a composition that forms an independent part of a document, page, or site.
banner
A region that contains mostly site-oriented content, rather than page-specific content.
button
An input that allows for user-triggered actions when clicked or pressed. See related link.
cell
A cell in a tabular container. See related gridcell.
checkbox
A checkable input that has three possible values: true, false, or mixed.
columnheader
A cell containing header information for a column.
combobox
A composite widget containing a single-line textbox and another element, such as a listbox or grid, that can dynamically pop up to help the user set the value of the textbox.
command (abstract role)
A form of widget that performs an action but does not receive input data.
complementary
A supporting section of the document, designed to be complementary to the main content at a similar level in the DOM hierarchy, but remains meaningful when separated from the main content.
composite (abstract role)
A widget that may contain navigable descendants or owned children.
contentinfo
A large perceivable region that contains information about the parent document.
definition
A definition of a term or concept. See related term.
dialog
A dialog is a descendant window of the primary window of a web application. For HTML pages, the primary application window is the entire web document, i.e., the body element.
directory
A list of references to members of a group, such as a static table of contents.
document
An element containing content that assistive technology users may want to browse in a reading mode.
feed
A scrollable list of articles where scrolling may cause articles to be added to or removed from either end of the list.
figure
A perceivable section of content that typically contains a graphical document, images, code snippets, or example text. The parts of a figure MAY be user-navigable.
form
A landmark region that contains a collection of items and objects that, as a whole, combine to create a form. See related search.
grid
A composite widget containing a collection of one or more rows with one or more cells where some or all cells in the grid are focusable by using methods of two-dimensional navigation, such as directional arrow keys.
gridcell
A cell in a grid or treegrid.
group
A set of user interface objects which are not intended to be included in a page summary or table of contents by assistive technologies.
heading
A heading for a section of the page.
img
A container for a collection of elements that form an image.
input (abstract role)
A generic type of widget that allows user input.
landmark (abstract role)
A perceivable section containing content that is relevant to a specific, author-specified purpose and sufficiently important that users will likely want to be able to navigate to the section easily and to have it listed in a summary of the page. Such a page summary could be generated dynamically by a user agent or assistive technology.
link
An interactive reference to an internal or external resource that, when activated, causes the user agent to navigate to that resource. See related button.
list
A section containing listitem elements. See related listbox.
listbox
A widget that allows the user to select one or more items from a list of choices. See related combobox and list.
listitem
A single item in a list or directory.
log
A type of live region where new information is added in meaningful order and old information may disappear. See related marquee.
main
The main content of a document.
marquee
A type of live region where non-essential information changes frequently. See related log.
math
Content that represents a mathematical expression.
menu
A type of widget that offers a list of choices to the user.
menubar
A presentation of menu that usually remains visible and is usually presented horizontally.
menuitem
An option in a set of choices contained by a menu or menubar.
menuitemcheckbox
A menuitem with a checkable state whose possible values are true, false, or mixed.
menuitemradio
A checkable menuitem in a set of elements with the same role, only one of which can be checked at a time.
navigation
A collection of navigational elements (usually links) for navigating the document or related documents.
none
An element whose implicit native role semantics will not be mapped to the accessibility API. See synonym presentation.
note
A section whose content is parenthetic or ancillary to the main content of the resource.
option
A selectable item in a select list.
presentation
An element whose implicit native role semantics will not be mapped to the accessibility API. See synonym none.
progressbar
An element that displays the progress status for tasks that take a long time.
radio
A checkable input in a group of elements with the same role, only one of which can be checked at a time.
radiogroup
A group of radio buttons.
range (abstract role)
An input representing a range of values that can be set by the user.
region
A perceivable section containing content that is relevant to a specific, author-specified purpose and sufficiently important that users will likely want to be able to navigate to the section easily and to have it listed in a summary of the page. Such a page summary could be generated dynamically by a user agent or assistive technology.
roletype (abstract role)
The base role from which all other roles in this taxonomy inherit.
row
A row of cells in a tabular container.
rowgroup
A structure containing one or more row elements in a tabular container.
rowheader
A cell containing header information for a row in a grid.
scrollbar
A graphical object that controls the scrolling of content within a viewing area, regardless of whether the content is fully displayed within the viewing area.
search
A landmark region that contains a collection of items and objects that, as a whole, combine to create a search facility. See related form and searchbox.
searchbox
A type of textbox intended for specifying search criteria. See related textbox and search.
section (abstract role)
A renderable structural containment unit in a document or application.
sectionhead (abstract role)
A structure that labels or summarizes the topic of its related section.
select (abstract role)
A form widget that allows the user to make selections from a set of choices.
separator
A divider that separates and distinguishes sections of content or groups of menuitems.
slider
A user input where the user selects a value from within a given range.
spinbutton
A form of range that expects the user to select from among discrete choices.
status
A type of live region whose content is advisory information for the user but is not important enough to justify an alert, often but not necessarily presented as a status bar.
structure (abstract role)
A document structural element.
switch
A type of checkbox that represents on/off values, as opposed to checked/unchecked values. See related checkbox.
tab
A grouping label providing a mechanism for selecting the tab content that is to be rendered to the user.
table
A section containing data arranged in rows and columns. See related grid.
tablist
A list of tab elements, which are references to tabpanel elements.
tabpanel
A container for the resources associated with a tab, where each tab is contained in a tablist.
term
A word or phrase with a corresponding definition. See related definition.
textbox
A type of input that allows free-form text as its value.
timer
A type of live region containing a numerical counter which indicates an amount of elapsed time from a start point, or the time remaining until an end point.
toolbar
A collection of commonly used function buttons or controls represented in compact visual form.
tooltip
A contextual popup that displays a description for an element.
tree
A type of list that may contain sub-level nested groups that can be collapsed and expanded.
treegrid
A grid whose rows can be expanded and collapsed in the same manner as for a tree.
treeitem
An option item of a tree. This is an element within a tree that may be expanded or collapsed if it contains a sub-level group of tree item elements.
widget (abstract role)
An interactive component of a graphical user interface (GUI).
window (abstract role)
A browser or application window.

alert (role)§

A type of live region with important, and usually time-sensitive, information. See related alertdialog and status.

Alerts are used to convey messages to alert the user. In the case of audio warnings this is an accessible alternative for a hearing-impaired user. The alert role goes on the node containing the alert message. Alerts are specialized forms of the status role, which will be processed as an atomic live region.

Alerts are assertive live regions and will be processed as such by assistive technologies. Neither authors nor user agents are required to set or manage focus to them in order for them to be processed. Since alerts are not required to receive focus, content authors SHOULD NOT require users to close an alert. If the operating system allows, the user agent SHOULD fire a system alert event through the accessibility API when the WAI-ARIA alert is created. If an alert requires focus to close the alert, then content authors SHOULD use alertdialog instead.

Elements with the role alert have an implicit aria-live value of assertive, and an implicit aria-atomic value of true.

Characteristics:
CharacteristicValue
Superclass Role: section
Subclass Roles:
Related Concepts:
Inherited States and Properties:
Name From: author
Implicit Value for Role: Default for aria-live is assertive.
Default for aria-atomic is true.

alertdialog (role)§

A type of dialog that contains an alert message, where initial focus goes to an element within the dialog. See related alert and dialog.

Alert dialogs are used to convey messages to alert the user. The alertdialog role goes on the node containing both the alert message and the rest of the dialog. Content authors SHOULD make alert dialogs modal by ensuring that, while the alertdialog is shown, keyboard and mouse interactions only operate within the dialog. See aria-modal.

Unlike alert, alertdialog can receive a response from the user. For example, to confirm that the user understands the alert being generated. When the alert dialog is displayed, authors SHOULD set focus to an active element within the alert dialog, such as a form edit field or an OK button. The user agent SHOULD fire a system alert event through the accessibility API when the alert is created, provided one is specified by the intended accessibility API.

Authors SHOULD use aria-describedby on an alertdialog to reference the alert message element in the dialog. If they do not, an assistive technology can resort to its internal recovery mechanism to determine the contents of the alert message.

Characteristics:
CharacteristicValue
Superclass Role:
Related Concepts:
Inherited States and Properties:
Name From: author
Accessible Name Required: True

application (role)§

A structure containing one or more focusable elements requiring user input, such as keyboard or gesture events, that do not follow a standard interaction pattern supported by a widget role.

Some user agents and assistive technologies have a browse mode where standard input events, such as up and down arrow key events, are intercepted and used to control a reading cursor. This browse mode behavior prevents elements that do not have a widget role from receiving and using such keyboard and gesture events to provide interactive functionality.

When there is a need to create an element with an interaction model that is not supported by any of the WAI-ARIA widget roles, authors MAY give that element role application. And, when a user navigates into an element with role application, assistive technologies that intercept standard input events SHOULD switch to a mode that passes most or all standard input events through to the web application.

For example, a presentation slide editor uses arrow keys to change the positions of textbox and image elements on the slide. There are not any WAI-ARIA widget roles that correspond to such an interaction model so an author could give the slide container role application, an aria-roledescription of "Slide Editor", and use aria-describedby to provide instructions.

Because only the focusable elements contained in an application element are accessible to users of some assistive technologies, authors MUST use one of the following techniques to ensure all non-decorative static text or image content inside an application is accessible:

  1. Associate the content with a focusable element using aria-labelledby or aria-describedby.
  2. Place the content in a focusable element that has role document or article.
  3. Manage focus of descendants as described in Managing Focus, updating the value of aria-activedescendant to reference the element containing the focused content.
Characteristics:
CharacteristicValue
Superclass Role: structure
Related Concepts:
Supported States and Properties: aria-activedescendant
Inherited States and Properties:
Name From: author
Accessible Name Required: True

article (role)§

A section of a page that consists of a composition that forms an independent part of a document, page, or site.

An article is not a navigational landmark, but may be nested to form a discussion where assistive technologies could pay attention to article nesting to assist the user in following the discussion. An article could be a forum post, a magazine or newspaper article, a web log entry, a user-submitted comment, or any other independent item of content. It is independent in that its contents could stand alone, for example in syndication. However, the element is still associated with its ancestors; for instance, contact information that applies to a parent body element still covers the article as well. When nesting articles, the child articles represent content that is related to the content of the parent article. For instance, a web log entry on a site that accepts user-submitted comments could represent the comments as articles nested within the article for the web log entry. Author, heading, date, or other information associated with an article does not apply to nested articles.

When the user navigates to an element assigned the role of article, assistive technologies that typically intercept standard keyboard events SHOULD switch to document browsing mode, as opposed to passing keyboard events through to the web application. Assistive technologies MAY provide a feature allowing the user to navigate the hierarchy of any nested article elements.

When an article is in the context of a feed, the author MAY specify values for aria-posinset and aria-setsize.

Characteristics:
CharacteristicValue
Superclass Role: document
Related Concepts:
Supported States and Properties:
Inherited States and Properties:
Name From: author

button (role)§

An input that allows for user-triggered actions when clicked or pressed. See related link.

Buttons are mostly used for discrete actions. Standardizing the appearance of buttons enhances the user's recognition of the widgets as buttons and allows for a more compact display in toolbars.

Buttons support the optional attribute aria-pressed. Buttons with a non-empty aria-pressed attribute are toggle buttons. When aria-pressed is true the button is in a "pressed" state, when aria-pressed is false it is not pressed. If the attribute is not present, the button is a simple command button.

Characteristics:
CharacteristicValue
Superclass Role: command
Base Concept: HTML button
Related Concepts:
Supported States and Properties:
Inherited States and Properties:
Name From:
  • contents
  • author
Accessible Name Required: True
Children Presentational: True

cell (role)§

A cell in a tabular container. See related gridcell.

Authors MUST ensure elements with role cell are contained in, or owned by, an element with the role row.

Characteristics:
CharacteristicValue
Superclass Role: section
Subclass Roles:
Base Concept: HTML td
Required Context Role: row
Supported States and Properties:
Inherited States and Properties:
Name From:
  • contents
  • author

checkbox (role)§

A checkable input that has three possible values: true, false, or mixed.

The aria-checked attribute of a checkbox indicates whether the input is checked (true), unchecked (false), or represents a group of elements that have a mixture of checked and unchecked values (mixed). Many checkboxes do not use the mixed value, and thus are effectively boolean checkboxes.

Characteristics:
CharacteristicValue
Superclass Role: input
Subclass Roles:
Related Concepts:
Required States and Properties:
Supported States and Properties:
Inherited States and Properties:
Name From:
  • contents
  • author
Accessible Name Required: True
Children Presentational: True
Implicit Value for Role: Default for aria-checked is false.

columnheader (role)§

A cell containing header information for a column.

columnheader can be used as a column header in a table or grid. It could also be used in a pie chart to show a similar relationship in the data.

The columnheader establishes a relationship between it and all cells in the corresponding column. It is the structural equivalent to an HTML th element with a column scope.

Authors MUST ensure elements with role columnheader are contained in, or owned by, an element with the role row.

Applying the aria-selected state on a columnheader MUST not cause the user agent to automatically propagate the aria-selected state to all the cells in the corresponding column. An author MAY choose to propagate selection in this manner depending on the specific application.

While the columnheader role can be used in both interactive grids and non-interactive tables, the use of aria-readonly and aria-required is only applicable to interactive elements. Therefore, authors SHOULD NOT use aria-required or aria-readonly in a columnheader that descends from a table, and user agents SHOULD NOT expose either property to assistive technologies unless the columnheader descends from a grid.

Note

Because cells are organized into rows, there is not a single container element for the column. The column is the set of gridcell elements in a particular position within their respective row containers.

Characteristics:
CharacteristicValue
Superclass Role:
Base Concept: HTML th[scope="col"]
Required Context Role: row
Supported States and Properties: aria-sort
Inherited States and Properties:
Name From:
  • contents
  • author
Accessible Name Required: True

combobox (role)§

A composite widget containing a single-line textbox and another element, such as a listbox or grid, that can dynamically pop up to help the user set the value of the textbox.

Authors MUST ensure an element with role combobox contains or owns a text input element with role textbox or searchbox and that the text input has aria-multiline set to false. If the combobox provides autocompletion behavior for the text input as described in aria-autocomplete, authors MUST set aria-autocomplete on the textbox element to the value that corresponds to the provided behavior.

Typically, the default state of a combobox is collapsed. In the collapsed state, only the textbox element of a combobox is visible. A combobox is said to be expanded when both the textbox and a secondary element that serves as its popup are visible. Authors MUST set aria-expanded to true on an element with role combobox when it is expanded and false when it is collapsed. Elements with the role combobox have an implicit aria-expanded value of false.

When a combobox is expanded, authors MUST ensure it contains or owns an element that has a role of listbox, tree, grid, or dialog. This element is the combobox popup. When the combobox is expanded, authors MUST set aria-controls on the textbox element to a value that refers to the combobox popup element.

Elements with the role combobox have an implicit aria-haspopup value of listbox. If the combobox popup element has a role other than listbox, authors MUST specify a value for aria-haspopup that corresponds to the type of its popup.

To be keyboard accessible, authors SHOULD manage focus of descendants for all instances of this role, as described in Managing Focus. When a combobox receives focus, authors SHOULD ensure focus is placed on the textbox element.

Authors SHOULD provide keyboard mechanisms for moving focus between the textbox element and the elements contained in the popup. For example, one common convention is that Down Arrow moves focus from the text input to the first focusable descendant of the popup element. If the popup element supports aria-activedescendant, in lieu of moving focus, such keyboard mechanisms can control the value of aria-activedescendant on the textbox element. When a descendant of the popup element is active, authors MAY set aria-activedescendant on the textbox to a value that refers to the active element within the popup while focus remains on the textbox element.

Example 5
<div aria-label="Tag" role="combobox" aria-expanded="true" aria-owns="owned_listbox" aria-haspopup="listbox">
    <input type="text" aria-autocomplete="list" aria-controls="owned_listbox" aria-activedescendant="selected_option">
</div>
<ul role="listbox" id="owned_listbox">
    <li role="option">Zebra</li>
    <li role="option" id="selected_option">Zoom</li>
</ul>

The ARIA 1.0 specification describes a combobox pattern where a text input element has the combobox role and owns a listbox element. User agents, assistive technologies, and conformance checkers SHOULD continue to support the ARIA 1.0 pattern so that existing implementations of the ARIA 1.0 pattern remain functional.

The features and behaviors of combobox implementations vary widely. Consequently, there are many important authoring considerations. See the WAI-ARIA Authoring Practices Guide [wai-aria-practices-1.1] for additional details on implementing combobox design patterns.

Characteristics:
CharacteristicValue
Superclass Role: select
Related Concepts:
Required Owned Elements: textbox and, when expanded, one of:
Required States and Properties:
Supported States and Properties:
Inherited States and Properties:
Name From: author
Accessible Name Required: True
Implicit Value for Role: Default for aria-expanded is false.
Default for aria-haspopup is listbox.

command (abstract role)§

A form of widget that performs an action but does not receive input data.

Note

command is an abstract role used for the ontology. Authors should not use this role in content.

Characteristics:
CharacteristicValue
Is Abstract: True
Superclass Role: widget
Subclass Roles:
Related Concepts:
Inherited States and Properties:
Name From: author

complementary (role)§

A supporting section of the document, designed to be complementary to the main content at a similar level in the DOM hierarchy, but remains meaningful when separated from the main content.

There are various types of content that would appropriately have this role. For example, in the case of a portal, this may include but not be limited to show times, current weather, related articles, or stocks to watch. The complementary role indicates that contained content is relevant to the main content. If the complementary content is completely separable from the main content, it may be appropriate to use a more general role.

User agents SHOULD treat elements with the role of complementary as navigational landmarks.

Characteristics:
CharacteristicValue
Superclass Role: landmark
Inherited States and Properties:
Name From: author

composite (abstract role)§

A widget that may contain navigable descendants or owned children.

Authors SHOULD ensure that a composite widget exists as a single navigation stop within the larger navigation system of the web page. Once the composite widget has focus, authors SHOULD provide a separate navigation mechanism for users to navigate to elements that are descendants or owned children of the composite element.

Note

composite is an abstract role used for the ontology. Authors should not use this role in content.

Characteristics:
CharacteristicValue
Is Abstract: True
Superclass Role: widget
Subclass Roles:
Supported States and Properties: aria-activedescendant
Inherited States and Properties:
Name From: author

contentinfo (role)§

A large perceivable region that contains information about the parent document.

Examples of information included in this region of the page are copyrights and links to privacy statements.

User agents SHOULD treat elements with the role of contentinfo as navigational landmarks.

Within any document or application, the author SHOULD mark no more than one element with the contentinfo role.

Note

Because document and application elements can be nested in the DOM, they may have multiple contentinfo elements as DOM descendants, assuming each of those is associated with different document nodes, either by a DOM nesting (e.g., document within document) or by use of the aria-owns attribute.

Characteristics:
CharacteristicValue
Superclass Role: landmark
Inherited States and Properties:
Name From: author

definition (role)§

A definition of a term or concept. See related term.

Authors SHOULD identify the element being defined by giving that element a role of term and referencing it with the aria-labelledby attribute.

Characteristics:
CharacteristicValue
Superclass Role: section
Related Concepts:
Inherited States and Properties:
Name From: author

dialog (role)§

A dialog is a descendant window of the primary window of a web application. For HTML pages, the primary application window is the entire web document, i.e., the body element.

Dialogs are most often used to prompt the user to enter or respond to information. A dialog that is designed to interrupt workflow is usually modal. See related alertdialog.

Authors SHOULD provide a dialog label, which can be done with the aria-label or aria-labelledby attribute.

Authors SHOULD ensure that all dialogs (both modal and non-modal) have at least one focusable descendant element. Authors SHOULD focus an element in the modal dialog when it is displayed, and authors SHOULD manage focus of modal dialogs.

Note

In the description of this role, the term "web application" does not refer to the application role, which specifies specific assistive technology behaviors.

Characteristics:
CharacteristicValue
Superclass Role: window
Subclass Roles:
Inherited States and Properties:
Name From: author
Accessible Name Required: True

directory (role)§

A list of references to members of a group, such as a static table of contents.

Authors SHOULD use this role for a static table of contents, whether linked or unlinked. This includes tables of contents built with lists, including nested lists. Dynamic tables of contents, however, might use a tree role instead.

Characteristics:
CharacteristicValue
Superclass Role: list
Related Concepts:
Inherited States and Properties:
Name From: author

document (role)§

An element containing content that assistive technology users may want to browse in a reading mode.

When user agent focus moves to an element assigned the role of document, assistive technologies having a reading mode for browsing static content MAY switch to that reading mode and intercept standard input events, such as Up or Down arrow keyboard events, to control the reading cursor.

Because assistive technologies that have a reading mode default to that mode for all elements except for those with either a widget or application role, the only circumstance where the document role is useful for changing assistive technology behavior is when the element with role document is a focusable child element of a widget or application. For example, given an application element which contains some static rich text, the author can apply role document to the element containing the text and give it a tabindex of 0. When a screen reader user presses the Tab key and places focus on the document element, the user will be able to read the text with the screen reader's reading cursor.

Characteristics:
CharacteristicValue
Superclass Role: structure
Subclass Roles:
Related Concepts:
Supported States and Properties: aria-expanded
Inherited States and Properties:
Name From: author
Accessible Name Required: False

feed (role)§

A scrollable list of articles where scrolling may cause articles to be added to or removed from either end of the list.

A feed enables users of assistive technologies that have a document browse mode, such as screen readers, to use the browse mode reading cursor to both read and scroll through a stream of rich content that may continue scrolling infinitely by loading more content as the user reads. In a feed, assistive technologies provide a web application with signals of the user's reading cursor movement by moving user agent focus, enabling the application to both add new content and visually position content as the user browses the page. The feed also lets authors inform assistive technologies when additions and removals are occurring so assistive technologies can more reliably update their reading view without disrupting reading or degrading performance.

For example, a feed could be used to present a stream of news stories where each article contains a story with text, links, images, and comments as well as widgets for sharing and commenting. As a screen reader user reads and interacts with each story and moves the screen reader reading cursor from story to story, each story scrolls into view and, as needed, new stories are loaded.

A feed is a container element whose children have role article. When articles are added or removed from either or both ends of a feed, authors SHOULD set aria-busy to true on the feed element before the changes are made and set it to false after the changes are complete. Authors SHOULD avoid inserting or removing articles in the middle of a feed. These requirements help assistive technologies gracefully respond to changes in the feed content that occur simultaneously with user commands to move the reading cursor within the feed.

Authors SHOULD make each article in a feed focusable and ensure that the application scrolls an article into view when user agent focus is set on the article or one of its descendant elements. For example, in HTML, each article element should have a tabindex value of either -1 or 0.

When an assistive technology reading cursor moves from one article to another, assistive technologies SHOULD set user agent focus on the article that contains the reading cursor. If the reading cursor lands on a focusable element inside the article, the assistive technology MAY set focus on that element in lieu of setting focus on the containing article.

Because the ability to scroll to another article with an assistive technology reading cursor depends on the presence of another article in the page, authors SHOULD attempt to load additional articles before user agent focus reaches an article at either end of the set of articles that has been loaded. Alternatively, authors MAY include an article at either or both ends of the loaded set of articles that includes an element, such as a button, that lets the user request more articles to be loaded.

In addition to providing a brief label, authors MAY apply aria-describedby to article elements in a feed to suggest to screen readers which elements to speak after the label when users navigate by article. Screen readers MAY provide users with a way to quickly scan feed content by speaking both the label and accessible description when navigating by article, enabling the user to ignore repetitive or less important elements, such as embedded interaction widgets, that the author has left out of the description.

Authors SHOULD provide keyboard commands for moving focus among articles in a feed so users who do not utilize an assistive technology that provides article navigation features can use the keyboard to navigate the feed.

If the number of articles available in a feed supply is static, authors MAY specify aria-setsize on article elements in that feed. However, if the total number is extremely large, indefinite, or changes often, authors MAY set aria-setsize to -1 to communicate the unknown size of the set.

See the WAI-ARIA Authoring Practices [wai-aria-practices-1.1] for additional details on implementing a feed design pattern.

Characteristics:
CharacteristicValue
Superclass Role: list
Required Owned Elements: article
Inherited States and Properties:
Name From: author
Accessible Name Required: False

figure (role)§

A perceivable section of content that typically contains a graphical document, images, code snippets, or example text. The parts of a figure MAY be user-navigable.

Authors SHOULD provide a reference to the figure from the main text, but the figure need not be displayed at the same location as the referencing element. Authors MAY reference text serving as a caption using aria-describedby. Authors MAY provide a label using aria-label or MAY reference text serving as a label using aria-labelledby.

Assistive technologies SHOULD enable users to quickly navigate to figures. Mainstream user agents MAY enable users to quickly navigate to figures.

Characteristics:
CharacteristicValue
Superclass Role: section
Related Concepts:
Inherited States and Properties:
Name From: author
Accessible Name Required: False

form (role)§

A landmark region that contains a collection of items and objects that, as a whole, combine to create a form. See related search.

A form may be a mix of host language form controls, scripted controls, and hyperlinks. Authors are reminded to use native host language semantics to create form controls, whenever possible. For search facilities, authors SHOULD use the search role and not the generic form role. Authors SHOULD provide a visible label for the form referenced with aria-labelledby. If an author uses a script to submit a form based on a user action that would otherwise not trigger an onsubmit event (for example, a form submission triggered by the user changing a form element's value), the author SHOULD provide the user with advance notification of the behavior.

User agents SHOULD treat elements with the role of form as navigational landmarks.

Characteristics:
CharacteristicValue
Superclass Role: landmark
Base Concept: HTML form
Inherited States and Properties:
Name From: author

grid (role)§

A composite widget containing a collection of one or more rows with one or more cells where some or all cells in the grid are focusable by using methods of two-dimensional navigation, such as directional arrow keys.

The grid role does not imply a specific visual, e.g., tabular, presentation. It describes relationships among elements. It may be used for purposes as simple as grouping a collection of checkboxes or navigation links or as complex as creating a full-featured spreadsheet application.

The cell elements of a grid have role gridcell. Authors MAY designate a cell as a row or column header by using either the rowheader or columnheader role in lieu of the gridcell role. Authors MUST ensure elements with role gridcell, columnheader, or rowheader are owned by elements with role row, which are in turn owned by an element with role rowgroup, or grid.

To be keyboard accessible, authors SHOULD manage focus of descendants of a grid as described in Managing Focus. When a user is navigating the grid content with a keyboard, authors SHOULD set focus as follows:

  • If a gridcell contains a single interactive widget that will not consume arrow key presses when it receives focus, such as a checkbox, button, or link, authors MAY set focus on the interactive element contained in that cell. This allows the contained widget to be directly operable.
  • Otherwise, authors SHOULD ensure the element that receives focus is a gridcell, rowheader, or columnheader element.

Authors SHOULD provide a mechanism for changing to an interaction or edit mode that allows users to navigate and interact with content contained inside a focusable cell if that focusable cell contains any of the following:

  • a widget that requires arrow keys to operate, e.g., a combobox or radiogroup
  • multiple interactive elements
  • editable content

For example, if a cell in a spreadsheet contains a combobox or editable text, the Enter key might be used to activate a cell interaction or editing mode when that cell has focus so the directional arrow keys can be used to operate the contained combobox or textbox. Depending on the implementation, pressing Enter again, Tab, Escape, or another key may switch the application back to the grid navigation mode.

Authors MAY use a gridcell to display the result of a formula, which could be editable by the user. In a spreadsheet application, for example, a gridcell may show a value calculated from a formula until the user activates the gridcell for editing when a textbox appears in the gridcell containing the formula in an editable state.

If aria-readonly is set on an element with role grid, user agents MUST propagate the value to all gridcell elements owned by the grid and expose the value in the accessibility API. An author MAY override the propagated value of aria-readonly for an individual gridcell element.

In a grid that provides cell content editing functions, if the content of a focusable gridcell element is not editable, authors MAY set aria-readonly to true on the gridcell element. However, the value of aria-readonly, whether specified for a grid or individual cells, only indicates whether the content contained in cells is editable. It does not represent availability of functions for navigating or manipulating the grid itself.

An unspecified value for aria-readonly does not imply that a grid or a gridcell contains editable content. For example, if a grid presents a collection of elements that are not editable, such as a collection of link elements representing dates in a datepicker, it is not necessary for the author to specify a value for aria-readonly.

Authors MAY indicate that a focusable gridcell is selectable as the object of an action with the aria-selected attribute. If the grid allows multiple gridcells to be selected, the author SHOULD set aria-multiselectable to true on the element with role grid.

Since WAI-ARIA can augment an element of the host language, a grid can reuse the elements and attributes of a native table, such as an HTML table element. For example, if an author applies the grid role to an HTML table element, the author does not need to apply the row and gridcell roles to the descendant HTML tr and td elements because the user agent will automatically make the appropriate translations. When the author is reusing a native host language table element and needs a gridcell element to span multiple rows or columns, the author SHOULD apply the appropriate host language attributes instead of WAI-ARIA aria-rowspan or aria-colspan properties.

See the WAI-ARIA Authoring Practices Guide [wai-aria-practices-1.1] for additional details on implementing grid design patterns.

Characteristics:
CharacteristicValue
Superclass Role:
Subclass Roles:
Base Concept: HTML table
Required Owned Elements:
Supported States and Properties:
Inherited States and Properties:
Name From: author
Accessible Name Required: True

gridcell (role)§

A cell in a grid or treegrid.

A gridcell may be focusable, editable, and selectable. A gridcell may have relationships such as aria-controls to address the application of functional relationships.

If an author intends a gridcell to have a row header, column header, or both, and if the relevant headers cannot be determined from the DOM structure, authors SHOULD explicitly indicate which header cells are relevant to the gridcell by applying aria-describedby on the gridcell and referencing elements with role rowheader or columnheader.

In a treegrid, authors MAY define a gridcell as expandable by using the aria-expanded attribute. If the aria-expanded attribute is provided, it applies only to the individual cell. It is not a proxy for the container row, which also can be expanded. The main use case for providing this attribute on a gridcell is pivot table behavior.

Authors MUST ensure elements with role gridcell are contained in, or owned by, an element with the role row.

Characteristics:
CharacteristicValue
Superclass Role:
Subclass Roles:
Base Concept: HTML td
Required Context Role: row
Supported States and Properties:
Inherited States and Properties:
Name From:
  • contents
  • author
Accessible Name Required: True

group (role)§

A set of user interface objects which are not intended to be included in a page summary or table of contents by assistive technologies.

Contrast with region which is a grouping of user interface objects that will be included in a page summary or table of contents.

Authors SHOULD use a group to form logical collection of items in a widget such as children in a tree widget forming a collection of siblings in a hierarchy, or a collection of items having the same container in a directory. However, when a group is used in the context of list, authors MUST limit its children to listitem elements. Therefore, proper handling of group by authors and assistive technologies is determined by the context in which it is provided.

Authors MAY nest group elements. If a section is significant enough to warrant inclusion in the web page's table of contents, the author SHOULD assign the section a role of region or a standard landmark role.

Characteristics:
CharacteristicValue
Superclass Role: section
Subclass Roles:
Related Concepts:
Supported States and Properties: aria-activedescendant
Inherited States and Properties:
Name From: author

heading (role)§

A heading for a section of the page.

Often, heading elements will be referenced with the aria-labelledby attribute of the section for which they serve as a heading. If headings are organized into a logical outline, the aria-level attribute is used to indicate the nesting level.

Characteristics:
CharacteristicValue
Superclass Role: sectionhead
Related Concepts:
Required States and Properties: aria-level
Inherited States and Properties:
Name From:
  • contents
  • author
Accessible Name Required: True
Implicit Value for Role: Default for aria-level is 2.

img (role)§

A container for a collection of elements that form an image.

An img can contain captions and descriptive text, as well as multiple image files that when viewed together give the impression of a single image. An img represents a single graphic within a document, whether or not it is formed by a collection of drawing objects. In order for elements with a role of img be perceivable, authors MUST provide alternative text or a label determined by the accessible name calculation.

Characteristics:
CharacteristicValue
Superclass Role: section
Related Concepts:
Inherited States and Properties:
Name From: author
Accessible Name Required: True
Children Presentational: True

input (abstract role)§

A generic type of widget that allows user input.

Characteristics:
CharacteristicValue
Is Abstract: True
Superclass Role: widget
Subclass Roles:
Related Concepts:
Inherited States and Properties:
Name From: author

landmark (abstract role)§

A perceivable section containing content that is relevant to a specific, author-specified purpose and sufficiently important that users will likely want to be able to navigate to the section easily and to have it listed in a summary of the page. Such a page summary could be generated dynamically by a user agent or assistive technology.

Authors designate the purpose of the content by assigning a role that is a subclass of the landmark role and, when needed, by providing a brief, descriptive label.

Elements with a role that is a subclass of the landmark role are known as landmark regions or navigational landmark regions. Assistive technologies SHOULD enable users to quickly navigate to landmark regions. Mainstream user agents MAY enable users to quickly navigate to landmark regions.

Note

landmark is an abstract role used for the ontology. Authors should not use this role in content.

Characteristics:
CharacteristicValue
Is Abstract: True
Superclass Role: section
Subclass Roles:
Inherited States and Properties:
Name From: author
Accessible Name Required: False

list (role)§

A section containing listitem elements. See related listbox.

Lists contain children whose role is listitem, or elements whose role is group which in turn contains children whose role is listitem.

Characteristics:
CharacteristicValue
Superclass Role: section
Subclass Roles:
Base Concept:
Required Owned Elements:
Inherited States and Properties:
Name From: author

listbox (role)§

A widget that allows the user to select one or more items from a list of choices. See related combobox and list.

Items within the list are static and, unlike standard HTML select elements, may contain images. List boxes contain children whose role is option.

To be keyboard accessible, authors SHOULD manage focus of descendants for all instances of this role, as described in Managing Focus.

Elements with the role listbox have an implicit aria-orientation value of vertical.

Characteristics:
CharacteristicValue
Superclass Role:
Related Concepts:
Required Owned Elements: option
Supported States and Properties:
Inherited States and Properties:
Name From: author
Accessible Name Required: True
Implicit Value for Role: Default for aria-orientation is vertical.

listitem (role)§

A single item in a list or directory.

Authors MUST ensure elements with role listitem are contained in, or owned by, an element with the role list or group.

Characteristics:
CharacteristicValue
Superclass Role: section
Subclass Roles:
Base Concept: HTML li
Related Concepts:
Required Context Role:
Supported States and Properties:
Inherited States and Properties:
Name From: author

log (role)§

A type of live region where new information is added in meaningful order and old information may disappear. See related marquee.

Examples include chat logs, messaging history, game log, or an error log. In contrast to other live regions, in this role there is a relationship between the arrival of new items in the log and the reading order. The log contains a meaningful sequence and new information is added only to the end of the log, not at arbitrary points.

Elements with the role log have an implicit aria-live value of polite.

Characteristics:
CharacteristicValue
Superclass Role: section
Inherited States and Properties:
Name From: author
Accessible Name Required: True
Implicit Value for Role: Default for aria-live is polite.

main (role)§

The main content of a document.

This marks the content that is directly related to or expands upon the central topic of the document. The main role is a non-obtrusive alternative for "skip to main content" links, where the navigation option to go to the main content (or other landmarks) is provided by the user agent through a dialog or by assistive technologies.

User agents SHOULD treat elements with the role of main as navigational landmarks.

Within any document or application, the author SHOULD mark no more than one element with the main role.

Note

Because document and application elements can be nested in the DOM, they may have multiple main elements as DOM descendants, assuming each of those is associated with different document nodes, either by a DOM nesting (e.g., document within document) or by use of the aria-owns attribute.

Characteristics:
CharacteristicValue
Superclass Role: landmark
Inherited States and Properties:
Name From: author

marquee (role)§

A type of live region where non-essential information changes frequently. See related log.

Common usages of marquee include stock tickers and ad banners. The primary difference between a marquee and a log is that logs usually have a meaningful order or sequence of important content changes.

Elements with the role marquee have an implicit aria-live value of off.

Characteristics:
CharacteristicValue
Superclass Role: section
Inherited States and Properties:
Name From: author
Accessible Name Required: True

math (role)§

Content that represents a mathematical expression.

Content with the role math is intended to be marked up in an accessible format such as MathML [MathML3], or with another type of textual representation such as TeX or LaTeX, which can be converted to an accessible format by native browser implementations or a polyfill library.

While it is not ideal to use an image of a mathematical expression, there exists a significant amount of legacy content where images are used to represent mathematical expressions. Authors SHOULD ensure that images of math are labeled by text that describes the mathematical expression as it might be spoken.

Note

Browsers that support native implementations of MathML are able to provide a more robust, accessible math experience than can be accomplished with plain text approximations of math. Some rendering engines have close integration with screen readers that allow spacial touch exploration of the formula and refreshable braille display output in the Nemeth Braille format. This level of integration is not supported with images of mathematical formulas, even if the author provides a plain text approximation.

At the time of this writing, some mainstream browsers do not support MathML natively, and must be retrofit using a JavaScript polyfill library. When authoring math content, use native MathML wherever possible, and test thoroughly. Use a polyfill library or provide a fallback image with a text alternative approximation if necessary.

MathML Example with Embedded TeX Annotation§

Example 6
<!-- Note: Use a JavaScript polyfill library to ensure
     this renders in user agents that do not support MathML. -->
<!-- The math element has an implicit role="math". -->
<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mi>x</mi>
    <mo>=</mo>
    <mfrac>
      <mrow>
        <mo form="prefix"></mo>
        <mi>b</mi>
        <mo>±</mo>
        <msqrt>
          <msup>
            <mi>b</mi>
            <mn>2</mn>
          </msup>
          <mo></mo>
          <mn>4</mn>
          <mo>&#x2062;<!-- &InvisibleTimes; --></mo>
          <mi>a</mi>
          <mo>&#x2062;<!-- &InvisibleTimes; --></mo>
          <mi>c</mi>
        </msqrt>
      </mrow>
      <mrow>
        <mn>2</mn>
        <mo>&#x2062;<!-- &InvisibleTimes; --></mo>
        <mi>a</mi>
      </mrow>
    </mfrac>
  </mrow>
  <annotation encoding="TeX">
    x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}
  </annotation>
</math>

Plain HTML or Polyfill DOM Result of the MathML Quadratic Formula§

If a rendering engine does not support a native math format such as MathML, authors MAY use JavaScript to downgrade the content to a format the browser can display, such as this HTML image using a data URI and plain text alternative.

Example 7
<img role="math" src="..." alt="x=⟮−b±√⟮b²−4ac⟯⟯÷2a">
Characteristics:
CharacteristicValue
Superclass Role: section
Inherited States and Properties:
Name From: author
Children Presentational: True

none (role)§

An element whose implicit native role semantics will not be mapped to the accessibility API. See synonym presentation.

Note

Note regarding the ARIA 1.1 none role.§

In ARIA 1.1, the working group introduced none as a synonym to the presentation role, due to author confusion surrounding the intended meaning of the word "presentation" or "presentational." Many individuals erroneously consider role="presentation" to be synonymous with aria-hidden="true", and we believe role="none" conveys the actual meaning more unambiguously.

Until implementations include sufficient support for role="none", web authors are advised to use the presentation role alone role="presentation" or redundantly as a fallback to the none role role="none presentation".

note (role)§

A section whose content is parenthetic or ancillary to the main content of the resource.

Characteristics:
CharacteristicValue
Superclass Role: section
Inherited States and Properties:
Name From: author

option (role)§

A selectable item in a select list.

Authors MUST ensure elements with role option are contained in, or owned by, an element with the role listbox. Options not associated with a listbox might not be correctly mapped to an accessibility API.

Elements with the role option have an implicit aria-selected value of false.

Characteristics:
CharacteristicValue
Superclass Role: input
Subclass Roles:
Base Concept: HTML option
Related Concepts:
Required Context Role: listbox
Required States and Properties:
Supported States and Properties:
Inherited States and Properties:
Name From:
  • contents
  • author
Accessible Name Required: True
Children Presentational: True
Implicit Value for Role: Default for aria-selected is false.

presentation (role)§

An element whose implicit native role semantics will not be mapped to the accessibility API. See synonym none.

Note

Note regarding the ARIA 1.1 none role.§

In ARIA 1.1, the working group introduced none as a synonym to the presentation role, due to author confusion surrounding the intended meaning of the word "presentation" or "presentational." Many individuals erroneously consider role="presentation" to be synonymous with aria-hidden="true", and we believe role="none" conveys the actual meaning more unambiguously.

Until implementations include sufficient support for role="none", web authors are advised to use the presentation role alone role="presentation" or redundantly as a fallback to the none role role="none presentation".

The intended use is when an element is used to change the look of the page but does not have all the functional, interactive, or structural relevance implied by the element type, or may be used to provide for an accessible fallback in older browsers that do not support WAI-ARIA.

Example use cases:

  • An element whose content is completely presentational (like a spacer image, decorative graphic, or clearing element);
  • An image that is in a container with the img role and where the full text alternative is available and is marked up with aria-labelledby and (if needed) aria-describedby;
  • An element used as an additional markup "hook" for CSS; or
  • A layout table and/or any of its associated rows, cells, etc.

For any element with a role of presentation and which is not focusable, the user agent MUST NOT expose the implicit native semantics of the element (the role and its states and properties) to accessibility APIs. However, the user agent MUST expose content and descendant elements that do not have an explicit or inherited role of presentation. Thus, the presentation role causes a given element to be treated as having no role or to be removed from the accessibility tree, but does not cause the content contained within the element to be removed from the accessibility tree.

For example, according to an accessibility API, the following markup elements would appear to have identical role semantics (no role) and identical content.

Example 8
<!-- 1. [role="presentation"] negates the implicit 'heading' role semantics but does not affect the contents. -->
<h1 role="presentation"> Sample Content </h1>

<!-- 2. There is no implicit role for span, so only the contents are exposed. -->
<span> Sample Content </span>

<!-- 3. Depending on styling and other factors, this role declaration is redundant in some implementations. -->
<span role="presentation"> Sample Content </span>

<!-- 4. In all cases, the element contents are exposed to accessibility APIs without any implied role semantics. -->
<!-- <> --> Sample Content <!-- </> -->

The presentation role is used on an element that has implicit native semantics, meaning that there is a default accessibility API role for the element. Some elements are only complete when additional descendant elements are provided. For example, in HTML, table elements (matching the grid role) require tr descendants (the row role), which in turn require th or td children (the gridcell, columnheader, rowheader roles). Similarly, lists require list item children. The descendant elements that complete the semantics of an element are described in WAI-ARIA as required owned elements.

When an explicit or inherited role of presentation is applied to an element with the implicit semantic of a WAI-ARIA role that has required owned elements, in addition to the element with the explicit role of presentation, the user agent MUST apply an inherited role of presentation to any owned elements that do not have an explicit role defined. Also, when an explicit or inherited role of presentation is applied to a host language element which has required children as defined by the host language specification, in addition to the element with the explicit role of presentation, the user agent MUST apply an inherited role of presentation to any required children that do not have an explicit role defined.

In HTML, the img element is treated as a single entity regardless of the type of image file. Consequently, using role="presentation" or role="none" on an HTML img is equivalent to using aria-hidden="true". In order to make the image contents accessible, authors can embed the object using an object or iframe element, or use inline SVG code, and follow the accessibility guidelines for the image content.

For any element with an explicit or inherited role of presentation and which is not focusable, user agents MUST ignore role-specific WAI-ARIA states and properties for that element. For example, in HTML, a ul or ol element with a role of presentation will have the implicit native semantics of its li elements removed because the list role to which the ul or ol corresponds has a required owned element of listitem. Likewise, although an HTML table element does not have an implicit native semantic role corresponding directly to a WAI-ARIA role, the implicit native semantics of its thead/tbody/tfoot/tr/th/td descendants will also be removed, because the HTML specification indicates that these are required structural descendants of the table element.

Note

Only the implicit native semantics of elements that correspond to WAI-ARIA required owned elements are removed. All other content remains intact, including nested tables or lists, unless those elements also have a explicit role of presentation applied.

For example, according to an accessibility API, the following markup elements would appear to have identical role semantics (no roles) and identical content.

Example 9
<!-- 1. [role="presentation"] negates the implicit 'list' and 'listitem' role semantics but does not affect the contents. -->
<ul role="presentation">
  <li> Sample Content </li>
  <li> More Sample Content </li>
</ul>

<!-- 2. There is no implicit role for "foo", so only the contents are exposed. -->
<foo>
  <foo> Sample Content </foo>
  <foo> More Sample Content </foo>
</foo>
Note

There are other WAI-ARIA roles with required children for which this situation is applicable (e.g., radiogroups and listboxes), but tables and lists are the most common real-world cases in which the presentation inheritance is likely to apply.

For any element with an explicit or inherited role of presentation, user agents MUST apply an inherited role of presentation to all host-language-specific labeling elements for the presentational element. For example, a table element with a role of presentation will have the implicit native semantics of its caption element removed, because the caption is merely a label for the presentational table.

Authors SHOULD NOT provide meaningful alternative text (for example, use alt="" in HTML) when the presentation role is applied to an image.

In the following code sample, the containing img and is appropriately labeled by the caption paragraph. In this example the img element can be marked as presentation because the role and the text alternatives are provided by the containing element.

Example 10
<div role="img" aria-labelledby="caption">
  <img src="example.png" role="presentation" alt="">
  <p id="caption">A visible text caption labeling the image.</p>
</div>

In the following code sample, because the anchor (HTML a element) is acting as the treeitem, the list item (HTML li element) is assigned an explicit WAI-ARIA role of presentation to override the user agent's implicit native semantics for list items.

Example 11
<ul role="tree">
  <li role="presentation">
	<a role="treeitem" aria-expanded="true">An expanded tree node</a>
  </li></ul>
Presentational Roles Conflict Resolution§

There are a number of ways presentational role conflicts are resolved.

Host languages elements, having implicit presentational roles for which no roles, may be applied, MUST never be exposed to in the accessibility tree. With this exception, user agents MUST always expose global WAI-ARIA states and properties to accessibility APIs. In this case, the user agent ignores the presentation role and exposes the element according to its implicit native semantics. However, user agents MUST ignore any non-global, role-specific WAI-ARIA states and properties, unless it is on an inherited presentational role where an explicit role is applied.

For example, aria-haspopup is a global attribute and would always be applied; aria-level is not a global attribute and would therefore only apply if the element was not in a presentational state.

Example 12
<!-- 1. [role="presentation"] is ignored due to the global aria-haspopup property. -->
<h1 role="presentation" aria-haspopup="true"> Sample Content </h1>
<!-- 2. [role="presentation"] negates the both the implicit 'heading' and the non-global level. -->
<h1 role="presentation" aria-level="2"> Sample Content </h1>

Explicit roles on a descendant or owned element override the inherited role of presentation, and cause the owned element to behave as any other element with an explicit role. If the action of exposing the implicit role causes the accessibility tree to be malformed, the expected results are undefined and the user agent MAY resort to an internal recovery mechanism to repair the accessibility tree.

If an element with a role of presentation is focusable, or otherwise interactive, user agents MUST ignore the normal effect of the role and expose the element with implicit native semantics, in order to ensure that the element is both understandable and operable.

User agents MUST always expose global WAI-ARIA states and properties to accessibility APIs, even if an element has an explicit or inherited role of presentation. In this case, the user agent ignores the presentation role and exposes the element according to its implicit native semantics. However, user agents MUST ignore any non-global, role-specific WAI-ARIA states and properties, unless it is on an inherited presentational role where an explicit role is applied.

Characteristics:
CharacteristicValue
Superclass Role: structure
Inherited States and Properties:
Name From: author (if role discarded by error conditions)

progressbar (role)§

An element that displays the progress status for tasks that take a long time.

A progressbar indicates that the user's request has been received and the application is making progress toward completing the requested action. The author SHOULD supply values for aria-valuenow, aria-valuemin, and aria-valuemax, unless the value is indeterminate, in which case the author SHOULD omit the aria-valuenow attribute. Authors SHOULD update these values when the visual progress indicator is updated. If the progressbar is describing the loading progress of a particular region of a page, the author SHOULD use aria-describedby to point to the status, and set the aria-busy attribute to true on the region until it is finished loading. It is not possible for the user to alter the value of a progressbar because it is always readonly.

Note

Assistive technologies generally will render the value of aria-valuenow as a percent of a range between the value of aria-valuemin and aria-valuemax, unless aria-valuetext is specified. It is best to set the values for aria-valuemin, aria-valuemax, and aria-valuenow in a manner that is appropriate for this calculation.

Characteristics:
CharacteristicValue
Superclass Role: range
Related Concepts:
Inherited States and Properties:
Name From: author
Accessible Name Required: True
Children Presentational: True

radio (role)§

A checkable input in a group of elements with the same role, only one of which can be checked at a time.

Authors SHOULD ensure that elements with role radio are explicitly grouped in order to indicate which ones affect the same value. This is achieved by enclosing the radio elements in an element with role radiogroup. If it is not possible to make the radio buttons DOM children of the radiogroup, authors SHOULD use the aria-owns attribute on the radiogroup element to indicate the relationship to its children.

Characteristics:
CharacteristicValue
Superclass Role:
Subclass Roles:
Related Concepts:
Required States and Properties:
Supported States and Properties:
Inherited States and Properties:
Name From:
  • contents
  • author
Accessible Name Required: True
Children Presentational: True
Implicit Value for Role: Default for aria-checked is false.

radiogroup (role)§

A group of radio buttons.

A radiogroup is a type of select list that can only have a single entry checked at any one time. Authors SHOULD enforce that only one radio button in a group can be checked at the same time. When one item in the group is checked, the previously checked item becomes unchecked (its aria-checked attribute becomes false).

Characteristics:
CharacteristicValue
Superclass Role: select
Related Concepts: list
Required Owned Elements: radio
Supported States and Properties:
Inherited States and Properties:
Name From: author
Accessible Name Required: True

range (abstract role)§

An input representing a range of values that can be set by the user.

Note

range is an abstract role used for the ontology. Authors should not use this role in content.

Characteristics:
CharacteristicValue
Is Abstract: True
Superclass Role: widget
Subclass Roles:
Supported States and Properties: aria-valuetext
Inherited States and Properties:
Name From: author

region (role)§

A perceivable section containing content that is relevant to a specific, author-specified purpose and sufficiently important that users will likely want to be able to navigate to the section easily and to have it listed in a summary of the page. Such a page summary could be generated dynamically by a user agent or assistive technology.

Authors SHOULD limit use of the region role to sections containing content with a purpose that is not accurately described by one of the other landmark roles, such as main, complementary, or navigation.

Authors MUST give each element with role region a brief label that describes the purpose of the content in the region. Authors SHOULD reference a visible label with aria-labelledby if a visible label is present. Authors SHOULD include the label inside of a heading whenever possible. The heading MAY be an instance of the standard host language heading element or an instance of an element with role heading.

Assistive technologies SHOULD enable users to quickly navigate to elements with role region. Mainstream user agents MAY enable users to quickly navigate to elements with role region.

Characteristics:
CharacteristicValue
Superclass Role: landmark
Related Concepts:
Inherited States and Properties:
Name From: author
Accessible Name Required: True

roletype (abstract role)§

The base role from which all other roles in this taxonomy inherit.

Properties of this role describe the structural and functional purpose of objects that are assigned this role (known in RDF terms as "instances"). A role is a concept that can be used to understand and operate instances.

Note

roletype is an abstract role used for the ontology. Authors should not use this role in content.

Characteristics:
CharacteristicValue
Is Abstract: True
Subclass Roles:
Related Concepts:
Supported States and Properties:
Name From:
  • n/a

row (role)§

A row of cells in a tabular container.

Rows contain cell or gridcell elements, and thus serve to organize the table or grid.

In a treegrid, authors MAY mark rows as expandable, using the aria-expanded attribute to indicate the present status. This is not the case for an ordinary table or grid, in which the aria-expanded attribute is not present.

Authors MUST ensure elements with role row are contained in, or owned by, an element with the role table, grid, rowgroup, or treegrid.

Characteristics:
CharacteristicValue
Superclass Role:
Base Concept: HTML tr
Required Context Role: