Accessibility Guide for deprecated
Ensures that the aria-roledescription attribute is only applied to elements having explicit or implicit role values.
Inappropriate aria-roledescription attribute values that clash with an element’s implicit or explicit role value can impede the web page’s accessibility. A contradictory aria-roledescription attribute value may have no effect on the application’s accessibility and may trigger behavior that blocks accessibility for entire application sections.
When aria-roledescription attributes are applied to HTML elements not in accordance with WAI-ARIA 1.1, a semantic conflict may occur between the aria-roledescription value and the implicit or explicit element role value, resulting in assistive technology products reporting nonsensical user interface (UI) information that does not accurately represent the intended UI experience.
What this Accessibility Rule Checks
Use aria-roledescription values to adequately explain implicit or explicit element role values.
Make sure that the kind attribute in the track element is set to captions. Also, verify that the text content of the captions adequately communicates all relevant information from the audio element, including speaker identification, dialogue transcripts, musical cues, and sound effects.
Below is an example code that demonstrates the addition of two tracks, one in English and another in Spanish.
<audio>
<source src="conversation.mp3" type="audio/mp3">
<track src="captions_en.vtt" kind="captions" srclang="en" label="english_captions">
<track src="captions_es.vtt" kind="captions" srclang="es" label="spanish_captions">
</audio>What this Accessibility Rule Checks
Checks the use of all HTML5 <audio> elements to ensure each contains a <track> element with the kind attribute value captions.
The value supplied to active ID attributes on focusable elements must be unique to avoid assistive technology from overlooking the second instance. Active ID attributes may not be used more than once on focusable components inside the same document; assistive technology requires unique IDs for focusable active elements in order to differentiate between them.
Focusable components on a page are identified exclusively by the ID attribute. It is illogical to duplicate an active ID.
Duplicate active ID values compromise the accessibility of focusable elements, such as form labels, table header cells, and so on. Screen readers and client-side scripts will bypass all instances of repetition other than the first. Validating HTML files aids in preventing and eliminating potential sources of accessibility issues, so long as accessibility is not compromised.
Those who have expertise with client-side scripting are aware that when an active ID is reused, the only instance that is normally acted upon by the script is the first. Similarly, assistive technology may only appropriately reference the first active ID when mentioning it.
What this Accessibility Rule Checks
Ensures that each page element with an active ID and a focusable state has a unique value.
To avoid assistive technology missing the second instance, the value supplied to an id property must be distinct. In other words, id attributes may not be used more than once to distinguish one element from another within the same document.
Elements on a page are uniquely identified via the ID attribute. It makes no sense to make a second id.
Duplicate ids can make labels for forms, table header cells, etc. inaccessible since screen readers and client-side scripts pass over the second iteration. They are typical markup validation mistakes that, if they do not damage accessibility, can reduce potential causes of accessibility issues.
Those who are familiar with client-side scripting are aware that when an ID is reused, the script normally only reacts to the first instance of that id use. Similar to this, assistive technology might only appropriately reference the first id when referencing an id.
What this Accessibility Rule Checks
Makes certain that every element on the page with an id attribute has a distinct value for the id attribute.