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Accessibility Checking for Large Sites

Rocket Validator integrates axe-core version 4.8 into an automated web site scanner.

Axe Core 4.7

<video> or <audio> elements must not play automatically

Ensures that video or audio elements don’t have autoplay audio that lasts more than three seconds without a way to silence it.

When using screen reading software, people who are blind or have low vision may have trouble hearing the screen reader’s spoken output if other audio is playing at the same time.

If automatically playing audio continues for more than three seconds, it must be possible to pause, stop, or adjust the level using a well placed, easily accessible mechanism.

Users of screen readers can hear the screen reader without any other sounds playing thanks to an audio control.

A screen reader user’s ability to find the stop button may be hampered if audio starts playing immediately when they land on a page. This is because they navigate by listening, and automatically starting sounds may obstruct that navigation.

Therefore, we oppose the practice of automatically starting sounds (especially if they run longer than three seconds) and encourage users to start the sound themselves once they arrive at the page rather than expecting them to stop the sound themselves once they have reached the page.

What this Accessibility Rule Checks

The algorithm for this rule returns:

  • Undefined when <audio> has no source (duration cannot be interpreted).
  • Undefined when <video> has no source (duration cannot be interpreted).
  • False when <audio> can autoplay and has no controls mechanism.
  • False when <video> can autoplay and has no controls mechanism
  • False when <audio> plays less than three seconds but loops.
  • True when <video> can autoplay and duration is less than three seconds (by passing options).
  • True when <video> can autoplay and duration is below allowed duration (by setting playback range).
  • True when <audio> can autoplay but has controls mechanism.
  • True when <video> can autoplay and has controls mechanism.

Learn more:

Related Accessibility Rules Checked by Rocket Validator