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<!DOCTYPE html><html lang="ja" xml:lang="ja" xmlns="http://www.w3.org/1999/xhtml"><head>
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<title>F23: 達成基準 1.4.2 の失敗例 － 3 秒よりも長く音声を再生していて、音声を止めるメカニズムがない| WAI | W3C</title>
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<a href="https://waic.jp/translations/WCAG22/Techniques/">WCAG 2.2 テクニック</a>
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<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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<h1><span>テクニック F23:</span>達成基準 1.4.2 の失敗例 － 3 秒よりも長く音声を再生していて、音声を止めるメカニズムがない</h1>
<section id="technique" class="box">
<h2 class="box-h box-h-icon">このテクニックについて</h2>
<div class="box-i">
<p>
このテクニックは
<a href="https://waic.jp/translations/WCAG22/Understanding/audio-control">1.4.2: 音声の制御</a>
(<strong>失敗</strong>) に関連する。</p>
<p>この失敗例は、音声でのインタラクションがあるものを除く、全ての技術に適用される。</p></div>
</section>
<section id="description">
<h2>解説</h2>
<p>この文書は、音声に関連する達成基準における失敗条件について述べている。音声が 3 秒以内に自動的にオフにならず、システム全体の音量レベルとは関係なくその音声をオフにする方法がない場合、達成基準 1.4.2 を満たすことができない。その音声は、この失敗条件に該当する。</p>
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<section id="examples">
<h2>事例</h2>
<section class="example" id="example-1"><h3>事例 1</h3>
<ul>
<li>絶え間なく BGM を再生しているサイト。</li>
</ul>
</section>
<section class="example" id="example-2"><h3>事例 2</h3>
<ul>
<li>停止するまでに 3 秒よりも長く続くナレーションがあり、それを停止させるメカニズムのないサイト。</li>
</ul>
</section>
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<h2>検証</h2>
<section class="procedure" id="procedure"><h3>手順</h3>
<ol>
<li>自動的に再生されて 3 秒よりも長く続く音声を停止させる方法がウェブページにあることをチェックする。
</li>
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<section class="results" id="expected-results">
<h3>期待される結果</h3>
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<li>チェック 1 が真でない場合、コンテンツは達成基準 1.4.2 の失敗となる。</li>
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<p><strong>Date:</strong> Updated 21 May 2025.</p>
<p><strong>Developed by</strong>
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<p>この文書は、2025 年 5 月 21 日付けの <a href="https://w3c.github.io/wcag/techniques/">Techniques for WCAG 2.2</a> を、<a href="https://waic.jp/">ウェブアクセシビリティ基盤委員会 (WAIC)</a> の翻訳ワーキンググループが翻訳して公開しているものです。この文書の正式版は、W3C のサイトにある英語版です。正確な内容については、W3C が公開している原文 (英語) をご確認ください。この翻訳文書は作業進行中です。また、あくまで参考情報であり、翻訳上の誤りが含まれていることがあります。
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