Alternative for time-based media (1.2.3.multimedia)
All time-based media includes clear audio descriptions or other media
alternatives (e.g. transcript, description)
Non-descriptive transcript:
This multimedia <video> element has
non-descriptive transcript (media-alternative):
(This violation triggers both 1.2.3 and 1.2.5 because transcript and
audio description is required for 1.2.3; and 1.2.5 requires audio
description as well.)
This is a test sample video with on-screen text and background sound.
Transcript:
The video shows the following text:
“Accessibility matters.”
Note: Hard to implement, as it's requires AI / human to check if
transcript is accurate.