accessibility-checker-engine
Version:
An automated accessibility checking engine for use by other tools
103 lines (87 loc) • 4.29 kB
HTML
<html lang="en-US">
<head>
<title>element_id_unique - Accessibility Checker Help</title>
<script>
RULE_MESSAGES = {"en-US":{"group":"Element 'id' attribute values must be unique within a document","pass":"Rule Passed","potential_empty":"The <{0}> element has the id \"{1}\" that is empty","potential_in_use":"The <{0}> element has the id \"{1}\" that is already in use"}};
RULE_ID = "element_id_unique"
</script>
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<!-- Title and messages generated at build time -->
<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">
<!-- Group message injected here -->
<h3 id="ruleMessage"></h3>
<!-- Severity level injected here -->
<div id="locLevel"></div>
<!-- Rule specific message injected here -->
<p id="groupLabel"></p>
</div>
</div>
<div class="bx--row">
<div class="bx--col-sm-4 bx--col-md-5 bx--col-lg-8 toolMain">
<!-- Start main panel -->
<mark-down><script type="text/plain">
### Why is this important?
The `id` attribute provides a machine-readable identifier for the elements of the page. A unique value for `id` allows browsers and assistive technologies to interpret and parse the content accurately.
<!-- This is where the code snippet is injected -->
<div id="locSnippet"></div>
### What to do
* For each element with an `id` attribute, provide a unique, non-empty value.
For example:
```
<h1 id="news">Breaking news</h1>
<p id="newsintro">The latest stories from our correspondents around the world.</p>
...
<div role="article" aria-labelledby="news" aria-describedby="newsintro">
...
</div>
```
Note: The [4.1.1 Parsing](https://www.w3.org/WAI/WCAG21/Understanding/parsing.html) requirement was removed from WCAG.
However, the Checker will report an issue against another accessibility requirement when it detects it causes an accessibility issue.
</script></mark-down>
<!-- End main panel -->
<!-- This is where the rule id is injected -->
<div id="ruleInfo"></div>
</div>
<div class="bx--col-sm-4 bx--col-md-3 bx--col-lg-4 toolSide">
<!-- Start side panel -->
<mark-down><script type="text/plain">
### About this requirement
<!-- Remove 4.1.1 * [IBM 4.1.1 Parsing ](https://www.ibm.com/able/requirements/requirements/#4_1_1) -->
* [H93: Ensuring that ID attributes are unique on a Web page](https://www.w3.org/WAI/WCAG22/Techniques/html/H93)
* [Failure F77: Duplicate values of type ID](https://www.w3.org/WAI/WCAG22/Techniques/failures/F77)
### Who does this affect?
* People using a screen reader, including blind, low vision, and neurodivergent people
</script></mark-down>
<!-- End side panel -->
</div>
</div>
</div>
</body>
</html>