accessibility-checker-engine
Version:
An automated accessibility checking engine for use by other tools
97 lines (84 loc) • 4.43 kB
HTML
<html lang="en-US">
<head>
<title>script_focus_blur_review - Accessibility Checker Help</title>
<script>
RULE_MESSAGES = {"en-US":{"Pass_0":"Rule Passed","Potential_1":"Verify script does not remove focus from content that normally receives focus","group":"Scripting must not remove focus from content that normally receives focus"}};
RULE_ID = "script_focus_blur_review"
</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">
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<div class="bx--col-sm-4 bx--col-md-8 bx--col-lg-16 toolHead">
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<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?
The system focus indicator is an important part of accessibility for keyboard users.
When focus is removed from a control via a script, the focus is transferred to another location, often to the browser window.
An example failure is `<input type="submit" onFocus="this.blur();">`.
This action interrupts the focus cycle and prevents keyboard users from being able to reach all of the links and controls on the page.
Users can only reach the content with a pointing device in this situation.
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<div id="locSnippet"></div>
### What to do
* If `blur` is being used simply to avoid the visual focus effect, this is a violation. Remove the call to `blur`.
* **Or**, if there is a reason why keyboard focus must be removed from this element, make sure you can still reach all interactive elements on this page using the keyboard tab and arrow keys
* **And**, focus remains until the user moves it
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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 2.1.1 Keyboard](https://www.ibm.com/able/requirements/requirements/#2_1_1)
* [IBM 2.4.7 Focus Visible](https://www.ibm.com/able/requirements/requirements/#2_4_7)
* [IBM 3.2.1 On Focus](https://www.ibm.com/able/requirements/requirements/#3_2_1)
* [Failure F55: Script removes focus](https://www.w3.org/WAI/WCAG22/Techniques/failures/F55)
### Who does this affect?
* People using a screen reader, including blind, low vision, and neurodivergentt people
* People who physically cannot use a pointing device
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