accessibility-checker-engine
Version:
An automated accessibility checking engine for use by other tools
102 lines (85 loc) • 5.54 kB
HTML
<html lang="en-US">
<head>
<title>aria_descendant_valid - Accessibility Checker Help</title>
<script>
RULE_MESSAGES = {"en-US":{"group":"Browsers ignore the explicit and implicit ARIA roles of the descendants of certain elements","pass":"The element contains valid descendants","potential_child_implicit_role":"The element with role \"{0}\" contains descendants with implicit roles \"{1}\" which are ignored by browsers","fail_child_explicit_role":"The element with role \"{0}\" contains descendants with roles \"{1}\" which are ignored by browsers"}};
RULE_ID = "aria_descendant_valid"
</script>
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<link rel="icon" href="https://ibm.com/able/favicon-32x32.png" type="image/png">
<link rel="icon" href="https://ibm.com/able/favicon.svg" type="image/svg+xml">
<link rel="stylesheet" href="../common/help.css" />
<script type="module">
import "https://1.www.s81c.com/common/carbon/web-components/version/v1.35.0/code-snippet.min.js";
import "https://1.www.s81c.com/common/carbon/web-components/version/v1.35.0/list.min.js";
</script>
<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
<script src="../common/help.js"></script>
</head>
<body>
<div class="bx--grid toolHelp">
<div class="bx--row">
<div class="bx--col-sm-4 bx--col-md-8 bx--col-lg-16 toolHead">
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<h3 id="ruleMessage"></h3>
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<p id="groupLabel"></p>
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<mark-down><script type="text/plain">
### Why is this important?
Correct roles and descendants help ensure that assistive technologies can gather the correct information about all the user interface components.
When certain elements that are specified in ARIA to have presentational descendants, browsers _should not_ expose the descendants through the platform accessibility API to assistive technologies.
If user agents do not hide the descendant's contents and semantics from the accessibility tree, some information may be presented (spoken) twice and confuse the end user.
The content contained by the element, i.e., inner text, as well as contents of all its descendants remains visible to assistive technologies,
except, of course, when the text is explicitly hidden, e.g., styled with `display:none` or has `aria-hidden="true"`.
This rule is triggered when one of the following elements contain more than presentational descendants: `button`, `checkbox`, `img`, `math`, `menuitemcheckbox`, `menuitemradio`, `option`, `progressbar`, `radio`, `scrollbar`, `separator`, `slider`, `switch`, and `tab`.
Refer to the table in [ARIA in HTML - Allowed descendants of ARIA roles](https://www.w3.org/TR/html-aria/#allowed-descendants-of-aria-roles) for the normative definition for each ARIA role,
the kinds of content categories for each role, and what [kinds of elements](https://html.spec.whatwg.org/multipage/dom.html#kinds-of-content) can be descendants.
For example, a `<button>` allows text and images but does not allow [interactive content](https://html.spec.whatwg.org/multipage/dom.html#interactive-content-2) or descendants with a tabindex attribute because that would confuse assistive technology users as to the expected content or behavior of the button.
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### What to do
* Remove the incorrect descendant element
</script></mark-down>
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<div id="ruleInfo"></div>
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<div class="bx--col-sm-4 bx--col-md-3 bx--col-lg-4 toolSide">
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<mark-down><script type="text/plain">
### About this requirement
* [IBM 4.1.2 Name, Role, Value](https://www.ibm.com/able/requirements/requirements/#4_1_2)
* [ARIA authoring practices guide](https://www.w3.org/WAI/ARIA/apg/)
* [ARIA specification - Presentational Children](https://www.w3.org/TR/wai-aria-1.2/#childrenArePresentational)
* [ARIA in HTML - Allowed descendants of ARIA roles](https://www.w3.org/TR/html-aria/#allowed-descendants-of-aria-roles)
### Who does this affect?
* People using a screen reader, including blind, low vision, and neurodivergent people
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