Responsive video needs improvements like responsive poster images for different image sizes based on device needs and post-pageload responsiveness like the picture element.
An issue proposes allowing a child picture element to act as a video element's poster image.
Responsive video currently lacks reevaluation of sources when media changes post-pageload, unlike the behavior of the picture element.
There's a need for web components to make browsers more responsive with videos, reevaluating media and time code when changes occur.
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