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Success Criterion:

Description

This rule checks that each role attribute has a valid value

Accessibility Requirements

This conformance rule relates to:

Test procedure

Applicability

Any non-empty role attribute that is specified on an HTML or SVG element that is included in the accessibility tree.

Note: Having a whitespace separated list of more than one token in the value of the role attribute is used for what is known as fallback roles. If the first token is not accessibility supported (or valid), the next one will be used for determining the semantic role of the element, and so forth.

Expectation

Each test target has a valid value that corresponds to a non-abstract WAI-ARIA role.

Note: Which specific roles to consider may depend on the type of content under test, such as web pages or digital publications, and are not limited to those defined by WAI-ARIA alone. Roles defined in separate WAI-ARIA modules, such as the Digital Publishing Module or the Graphics Module, may also be considered for this rule.

Assumptions

There are currently no assumptions

Accessibility Support

Older browsers do not support more than one token in the value for a role attribute. If multiple values are used in the role attribute, the attribute is ignored in these browsers.

Background

Test Cases

Passed

Passed example 1

Element with valid role value.

Code Snippet:
 <input type="text" role="textbox">
 
Example Output: Open in a new tab/ window

Passed example 2

Element with multiple valid role values.

Code Snippet:
 <span role="button link"></span>
 
Example Output: Open in a new tab/ window

Passed example 3

Element with at least one valid role value.

Code Snippet:
 <img role="presentation xyz" src="">
 
Example Output: Open in a new tab/ window

Failed

Failed example 1

Element with invalid role value.

Code Snippet:
 <input role="invalid" value="123">
 
Example Output: Open in a new tab/ window

Failed example 2

Element with multiple invalid role value.

Code Snippet:
 <input type="text" role="invalid role">
 
Example Output: Open in a new tab/ window

Inapplicable

Inapplicable example 1

Element with empty role attribute.

Code Snippet:
 <div role=" ">Some Content</div>
 
Example Output: Open in a new tab/ window

Inapplicable example 2

Element does not have role attribute.

Code Snippet:
 <div>Some Content</div>
 
Example Output: Open in a new tab/ window

Inapplicable example 3

Element with null role attribute.

Code Snippet:
 <div role>Some Content</div>
 
Example Output: Open in a new tab/ window

Inapplicable example 4

Element that is not included in the accessibility tree.

Code Snippet:
 <div aria-hidden="true" role="banner">Some Content</div>
 
Example Output: Open in a new tab/ window

Glossary

Included in the accessibility tree

Elements included in the accessibility tree of platform specific accessibility APIs. Elements in the accessibility tree are exposed to assistive technologies, allowing users to interact with the elements in a way that meet the requirements of the individual user.

The general rules for when elements are included in the accessibility tree are defined in the core accessibility API mappings. For native markup languages, such as HTML and SVG, additional rules for when elements are [included in the accessibility tree][] can be found in the HTML accessibility API mappings and the SVG accessibility API mappings.

Note: Users of assistive technologies might still be able to interact with elements that are not included in the accessibility tree. An example of this is a focusable element with an aria-hidden attribute with a value of true. Such an element could still be interacted with using sequential keyboard navigation regardless of the assistive technologies used, even though the element would not be included in the accessibility tree.

Non-empty text string

A string of characters (text) is considered “non-empty” if it contains 1 or more characters that are contained within any of the following unicode categories:

  • Ll: Letter, Lowercase
  • Lu: Letter, Uppercase
  • Lt: Letter, Titlecase
  • Lo: Letter, Other
  • Lm: Letter, Modifier
  • Nd: Number, Decimal Digit

For more details on unicode categories, check out www.fileformat.info/info/unicode/category/

Semantic Role

A semantic role is a semantic association that indicates an object’s type. This 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.

Roles can be implicit through the element type or explicit through the role attribute.

The role attribute takes a list of tokens. The semantic role is the first valid role in this list. If none of the tokens are valid, the implicit role will be used instead.

Non-abstract roles defined in the following specifications are considered valid:

Other roles may be added as they become available. Not all roles will be supported in all assistive technologies. Testers are encouraged to adjust which roles are allowed according to the accessibility support base line. For the purposes of executing test cases in all rules, it should be assumed that all roles are supported by assistive technologies so that none of the roles fail due to lack of accessibility support.

Note: For HTML elements the implicit roles are documented in ARIA in HTML.

Test Aspects

Test aspects are defined as part of the ACT Rules format 1.0.
  • DOM Tree

  • CSS Styling

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