accessibility-checker-engine
Version:
An automated accessibility checking engine for use by other tools
114 lines (97 loc) • 4.89 kB
HTML
<html lang="en-US">
<head>
<title>aria_hidden_nontabbable - Accessibility Checker Help</title>
<script>
RULE_MESSAGES = {"en-US":{"group":"A hidden element should not contain any tabbable elements","Pass_0":"Rule Passed","Fail_1":"Element \"{0}\" should not be focusable within the subtree of an element with an 'aria-hidden' attribute with value 'true'"}};
RULE_ID = "aria_hidden_nontabbable"
</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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<div id="locLevel"></div>
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<p id="groupLabel"></p>
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<div class="bx--row">
<div class="bx--col-sm-4 bx--col-md-5 bx--col-lg-8 toolMain">
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<mark-down><script type="text/plain">
### Why is this important?
Using either `role="presentation"` or `aria-hidden="true"` on a focusable element will result in some users focusing on "nothing".
A focusable element with `aria-hidden="true"` is ignored as part of the reading order,
but still part of the focus order,
making its state of visible or hidden unclear.
This rule checks that elements with an `aria-hidden` attribute do not contain focusable elements.
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<div id="locSnippet"></div>
### What to do
When designers and developers want to hide parts of a web page that are pure decoration,
such as icon fonts - that are not meant to be read by assistive technologies:
* ensure that assistive technologies will ignore the element by adding `aria-hidden="true"` to the element
*ensure none of the target elements are part of sequential focus navigation
* ensure no descendants are part of sequential focus navigation
### Example
* In the following example, the `button` element is focusable by default.
Therefore, using `aria-hidden="true"` violates the rule:
```
<div aria-hidden="true">
<div aria-hidden="false">
<button>Some button</button>
</div>
</div>
```
Note: Using `aria-hidden="false"` on a descendant of an element with `aria-hidden="true"` does not expose that element.
Using `aria-hidden="true"` hides itself and all its content from assistive technologies.
</script></mark-down>
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<div id="ruleInfo"></div>
</div>
<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 1.3.1 Info and Relationships](https://www.ibm.com/able/requirements/requirements/#1_3_1)
* [IBM 4.1.2 Name, Role, Value](https://www.ibm.com/able/requirements/requirements/#4_1_2)
* [Fourth Rule of ARIA Use](https://www.w3.org/TR/using-aria/#fourth)
* [ACT rule: Element with aria-hidden has no focusable content](https://act-rules.github.io/rules/6cfa84)
### Who does this affect?
* People using a screen reader, including blind, low vision, and neurodivergent people
</script></mark-down>
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</body>
</html>