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3.7.1 and 3.7.2 Intent and Examples from f2f (day 1)

From: Markku Hakkinen <markku.hakkinen@gmail.com>
Date: Fri, 26 Feb 2010 12:21:28 -0600
Message-ID: <3dcaabaf1002261021y57093a2ds3017d88f8b3b416f@mail.gmail.com>
To: UAWG list <w3c-wai-ua@w3.org>
3.7.1 Global Volume: The user can globally set volume of all audio
tracks it renders (including a "mute" setting) through available
operating environment mechanisms. (Level A)

Intent of Success Criterion 3.7.1:

User agents can render audio tracks from a variety sources, and in
some cases, multiple audio tracks may be present on a single page.
Users should be able to globally set the volume of audio track, rather
than having to adjust the volume of each audio track being played.

Examples of Success Criterion 3.7.1:

An operating system provides a master audio volume control that
applies to all audio tracks rendered within the environment, including
the user agent. The user may define a default volume level through a
preferences dialog that is retained across sessions.

A user encounters a page with two advertisments and one video which
began playback on page load complete. A global mute command, supported
via a mute key on the user's keyboard, allows the user to immediately
silence the playing audio tracks.

3.7.2 Speech Volume: The user agent allows the user to adjust the
volume of all audio tracks it renders, independent or relative to the
volume level at the operating environment.

Intent of Success Criterion 3.7.2:

Users of a screen reader or self voicing browser may encounter content
where the presentation volume of an audio track makes it difficult to
hear the text to speech synthesis of their screen reader or browser.
Users should be able to set the individual volume of audio tracks
rendered by the user agent, including text to speech synthesis,
independent of the operating environment's volume settings.

Examples of Success Criterion 3.7.2:

A self-voicing user agent provides separate audio volume controls the
speech synthesizer and audio tracks rendered from content. The user
may define default volume levels through a preferences dialog that is
retained across browsing sessions.

A user encounters a page a video which begins playback on page load
complete. A volume control for rendered audio tracks allows the user
to immediately silence the audio track, while leaving their screen
reader's text to speech synthesizer volume at their preferred level.
Received on Friday, 26 February 2010 18:22:00 GMT

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