SIA-R33<video> element visual-only content has transcript

Accessibility requirements

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

Description

Prerecorded <video> elements without audio must have all visual information available in a transcript.

Applicability

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

Expectations

  1. The visual information of each test target is available through a text transcript that is available either on the page or through a link. The text transcript needs to be visible and included in the accessibility tree.

A "text transcript" in the context of this rule is defined in WCAG 2 as an alternative for time based media.

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/ee13b5/. Copyright © 2021 W3C® (MIT, ERCIM, Keio, Beihang).