- From: Markku Hakkinen <markku.hakkinen@gmail.com>
- Date: Fri, 26 Feb 2010 12:21:28 -0600
- 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 UTC