Allow the user to slow the presentation rate of rendered audio and animation content (including video and animated images).
As part of satisfying provision one of this checkpoint, for a visual track, provide at least one setting between 40% and 60% of the original speed.
As part of satisfying provision one of this checkpoint, for a prerecorded audio track including audio-only presentations, provide at least one setting between 75% and 80% of the original speed.
When the user agent allows the user to slow the visual track of a synchronized multimedia presentation to between 100% and 80% of its original speed, synchronize the visual and audio tracks (per checkpoint 2.6). Below 80%, the user agent is not required to render the audio track.
Normative inclusions and exclusions
The user agent is not required to satisfy this checkpoint for audio and animations whose recognized role is to create a purely stylistic effect. Purely stylistic effects include background sounds, decorative animated images, and effects caused by style sheets.