SIA-R32<video> element visual-only content has audio track alternative

Accessibility requirements

This rule is not required for conformance to any accessibility requirements.

Description

Prerecorded <video> elements without audio must have an audio alternative.

Applicability

This rule applies to every prerecorded <video> element visible where the video doesn't contains audio.

Expectations

  1. The visual information of each test target is available through an audio track.

Assumptions

  • This rule assumes that a mechanism is available to start the video and that the video element is not simply used to display the poster.
  • This rule assumes that the language of each test target can be correctly determined (either programmatically or by analyzing the content), and sufficiently understood.

Accessibility support

This rule has no known accessibility support concerns.

Examples

Acknowledgments

This document includes material copied from or derived from https://act-rules.github.io/rules/d7ba54/. Copyright © 2021 W3C® (MIT, ERCIM, Keio, Beihang).