Web applications that host embedded media content via iframes may wish to respond to application input by temporarily hiding the media content.
These applications may not want to unload the entire iframe when it's not rendered since it could generate user-perceptible performance and experience issues when showing the media content again.
Performance issues when recreating the frame from scratch
Loss of data in forms
User could have a negative experience if the media continues to play and emit audio when not rendered.
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Feature summary
Permission policy to pause media playback on hidden iframes
Preventing an iframe and all of its children from playing media when the iframe is not being rendered.