Prepare "alternative content of time-dependent media" that accurately expresses all of the voice, video (no sound), video (with audio, so-called "synchronized media") in the page. To "accurate", like a script, it is necessary to be a sentence including detailed situation explanation.
If the media has interactive elements, it needs to have interactivity. For example, although it is a moving picture, the progress is once stopped at a certain scene, and options are presented to the viewer. If it is a content whose subsequent development varies depending on choices, it can be said that it is "accurate" for the first time by presenting its development with a hyperlink or the like.
|Principle||Perceivable||Information and user interface components must be presentable to users in ways they can perceive.|
|Guideline||Time-based Media||Provide alternatives for time-based media.|
|Criterion||Media Alternative (Prerecorded)
|Alternative content for time-based media is provided for all prerecorded synchronized media and prerecorded video-only media.|