Allow configuration not to render audio, video, or animated image content, except on explicit user request.
Normative inclusions and exclusions
This configuration is required for content rendered without any user interaction (including content rendered on load or as the result of a script), as well as content rendered as the result of user interaction that is not an explicit user request (e.g., when the user activates a link).
This checkpoint must be satisfied for all implemented audio, video, and animated image specifications; see the section on conformance profiles.
When configured not to render audio, video, or animated images except on explicit user request, the user agent is not required to retrieve them until the user requests them explicitly.