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Add explanation of what "automatic" means in 2.2.2 and 1.4.2, cross-reference #4012

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Add explanation of what "automatic" means in 2.2.2 and 1.4.2, cross-reference #4012

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patrickhlauke Aug 8, 2024
dd3a053
Remove the "audio" mention in the intent - this is not about audio, i…
patrickhlauke Aug 8, 2024
43c629b
Add explanation of what "starts automatically" means, plus notes with…
patrickhlauke Aug 8, 2024
9e48446
Add the same explanation of "automatic" to 1.4.2
patrickhlauke Aug 8, 2024
10a8283
Clean up formatting and add additional note to 2.3.3
patrickhlauke Aug 8, 2024
10957c5
Update understanding/20/audio-control.html
alastc Aug 23, 2024
c2a39ab
Update understanding/20/pause-stop-hide.html
alastc Aug 23, 2024
b511327
Update understanding/20/pause-stop-hide.html
alastc Aug 23, 2024
4b3558e
Update understanding/20/audio-control.html
alastc Aug 23, 2024
3e2cda7
Update understanding/20/audio-control.html
alastc Aug 23, 2024
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Update understanding/21/animation-from-interactions.html
alastc Aug 23, 2024
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Update understanding/20/pause-stop-hide.html
alastc Aug 23, 2024
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71 changes: 9 additions & 62 deletions understanding/20/audio-control.html
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<!DOCTYPE html>
<html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="UTF-8"></meta>
<meta charset="UTF-8"/>
<title>Understanding Audio Control</title>
<link rel="stylesheet" type="text/css" href="../../css/sources.css" class="remove"/>
</head>
<body>
<h1>Understanding Audio Control</h1>

<section id="brief">
<h2>In brief</h2>
<dl>
<dt>Goal</dt><dd>A page that plays music or sounds doesn't disrupt people.</dd>
<dt>What to do</dt><dd>If you play audio content automatically, let people turn it down or off.</dd>
<dt>Why it's important</dt><dd>Sound distracts some people, and also interferes with screen readers.</dd>
<dt>Why it's important</dt><dd>Sound distracts some people, and also interferes with screen readers.</dd>
</dl>

</section>

<section id="intent">
<h2>Intent of Audio Control</h2>


<p>Individuals who use screen reading software can find it hard to hear the speech output
if there is other audio playing at the same time. This difficulty is exacerbated when
the screen reader's speech output is software based (as most are today) and is controlled
via the same volume control as the sound. Therefore, it is important that the user
be able to turn off the background sound.
be able to turn off the background sound.
</p>
<p>Having control of the volume includes
being able to reduce its volume to zero. Muting the system volume is not "pausing or stopping" the autoplay audio. Both the "pause or stop" and control of audio volume need to be independent of the overall system volume.
</p>

<div class="note">

<p>Playing audio automatically when landing on a page may affect a screen reader user's
ability to find the mechanism to stop it because they navigate by listening and automatically
started sounds might interfere with that navigation. Therefore, we discourage the
practice of automatically starting sounds (especially if they last more than 3 seconds),
and encourage that the sound be
and encourage that the sound be
<em>started</em> by an action initiated by the user after they reach the page, rather than requiring
that the sound be
that the sound be
<em>stopped</em> by an action of the user after they land on the page.
</p>

</div>

<p>See also
<a href="low-or-no-background-audio">1.4.7: Low or No Background Audio</a>.
</p>


<p>See also <a href="low-or-no-background-audio">1.4.7 Low or No Background Audio</a>.</p>
<p>In the context of this Success Criterion, "plays automatically" broadly refers to audio that is not started/played as a direct result of a user's intentional activation. For example, not selecting a link or button.</p>
</section>
<section id="benefits">
<h2>Benefits of Audio Control</h2>


<ul>

<li>Individuals who use screen reading technologies can hear the screen reader without
other sounds playing. This is especially important for those who are hard of hearing
and for those whose screen readers use the system volume (so they cannot turn sound
down and screen reader up).
</li>

<li>This Success Criterion also benefits people who have difficulty focusing on visual
content (including text) when audio is playing.
</li>

</ul>

</section>

<section id="examples">
<h2>Examples of Audio Control</h2>

<ul>
<li>An audio file begins playing automatically when a page is opened. However, the audio
can be stopped by the user by selecting a "silent" link at the top of the page.
</li>
</ul>

</section>

<section id="resources">
<h2>Resources for Audio Control</h2>


</section>

<section id="techniques">
<h2>Techniques for Audio Control</h2>


<section id="sufficient">
<h3>Sufficient Techniques for Audio Control</h3>


<ul>

<li>

<a href="../Techniques/general/G60" class="general">Playing a sound that turns off automatically within three seconds</a>

</li>

<li>

<a href="../Techniques/general/G170" class="general">Providing a control near the top of the Web page that turns off sounds that play automatically</a>

</li>

<li>

<a href="../Techniques/general/G171" class="general">Playing sounds only on user request</a>

</li>

</ul>

</section>

<section id="advisory">
<h3>Additional Techniques (Advisory) for Audio Control</h3>


</section>

<section id="failure">
<h3>Failures for Audio Control</h3>


<ul>

<li>

<a href="../Techniques/failures/F23" class="failure">Failure due to playing a sound longer than 3 seconds where there is no mechanism to
turn it off
</a>

</li>

<li>

<a href="../Techniques/failures/F93" class="failure"></a>

</li>

</ul>

</section>

</section>

</body>
</html>
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