SIA-R26`<video>` element visual-only content is media alternative for text

Accessibility requirements

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

This rule checks prerecorded silent video is a media alternative for text on the page.

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

All the information contained in each target element is available as text (directly or via text alternatives) that is visible and included in the accessibility tree.
Each target element is labeled as a video alternative for text on the page. This label is visible and included in the accessibility tree.

The term label does not refer to the <label> element.

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.

This rule has no known accessibility support concerns.