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<!DOCTYPE html><html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><head>
<meta charset="UTF-8">
<title>[Obsolete] F4: Failure of Success Criterion 2.2.2 due to using text-decoration:blink without a mechanism to stop it in less than five seconds | WAI | W3C</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://w3.org/WAI/assets/css/style.css">
<link rel="stylesheet" href="../base.css">
</head>
<body dir="ltr" class="obsolete">
<a href="#main" class="button button--skip-link">Skip to content</a>
<div class="minimal-header-container default-grid">
<header class="minimal-header" id="site-header">
<div class="minimal-header-name">
<a href="https://waic.jp/translations/WCAG22/Techniques/">WCAG 2.2 テクニック</a>
</div>
<div class="minimal-header-subtitle">Examples of ways to meet WCAG; not required</div>
<a class="minimal-header-link" href="https://waic.jp/translations/WCAG22/Techniques/about">WCAG テクニックについて</a>
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<header class="box-h">Page Contents</header>
<div class="box-i">
<nav aria-label="page contents" class="navtoc">
<ul><li><a href="#technique">About this Technique</a></li>
<li><a href="#description">Description</a></li>
<li><a href="#examples">Examples</a></li>
<li><a href="#resources">Related Resources</a></li>
<li><a href="#related">Related Techniques</a></li>
<li><a href="#tests">Tests</a></li>
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<h1><span>Technique F4:</span>Failure of Success Criterion 2.2.2 due to using text-decoration:blink without a mechanism to stop it in less than five seconds</h1>
<section class="box obsolete-message">
<h2 class="box-h">廃止</h2>
<div class="box-i">CSS <a href="https://drafts.csswg.org/css-text-decor/#valdef-text-decoration-line-blink"><code>text-decoration:blink</code> 値は非推奨であり</a>、現在はモダンブラウザでサポートされていない。
</div>
</section>
<section id="technique" class="box">
<h2 class="box-h box-h-icon">About this Technique</h2>
<div class="box-i">
<p>This technique is not referenced from any Understanding document.</p>
<p>This failure applies to Cascading Style Sheets.</p></div>
</section>
<section id="description">
<h2>Description</h2>
<p>CSS defines the blink value for the text-decoration property. When used, it causes any text in elements with this property to blink at a predetermined rate. This cannot be interrupted by the user, nor can it be disabled as a user agent preference. The blinking continues as long as the page is displayed. Therefore, content that uses text-decoration:blink fails the success criterion because blinking can continue for more than five seconds.</p>
</section>
<section id="examples">
<h2>Examples</h2>
<section class="example" id="example-1"><h3>Example 1</h3>
<p>A product list page uses the text-decoration:blink style on an element to draw attention to sale prices. This fails the success criterion because users cannot control the blink.</p>
<pre xml:space="preserve"><code class="language-html"><p>My Great Product <span style="text-decoration:blink">Sale! $44,995!</span></p></code></pre>
</section>
</section>
<section id="resources">
<h2>Related Resources</h2>
<p style="margin-bottom: 1.5em;"><em><small>No endorsement implied.</small></em></p>
<ul>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#text-decoration-property">CSS Text Decoration Module Level 3: text-decoration property</a></li>
</ul>
</section>
<section id="related">
<h2>Related Techniques</h2>
<ul>
<li><a href="../client-side-script/SCR22">SCR22: Using scripts to control blinking and stop it in five seconds or less</a></li>
</ul>
</section>
<section id="tests">
<h2>Tests</h2>
<section class="procedure" id="procedure">
<h3>Procedure</h3>
<ol>
<li>Examine inline styles, internal stylesheets, and external stylesheets for the text-decoration property with a value of <code>blink</code>.</li>
<li>If the property is used, determine if the ID, class, or element identified by selectors on which this property is defined are used in the document.</li>
</ol>
</section>
<section class="results" id="expected-results">
<h3>Expected Results</h3>
<ul>
<li>If checks #1 and #2 are true, the content fails the success criterion.</li>
</ul>
</section>
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