Recall that applications may currently obtain a capture of the tab in which they run using getDisplayMedia(), either with or without preferCurrentTab. Moreover, soon another API will allow similar functionality: getViewportMedia(). In either case, the application may then also wish to crop the resulting video track so as to remove some content from it (typically before sharing it remotely). We introduce a performant and robust API for cropping a self-capture video track.


Applications need a performant and robust way to crop video tracks. For example, applications that combine video-conferencing and productivity-suite may wish to capture themselves, but only send the productivity-suite portion of themselves to remote participants, thereby avoiding a hall-of-mirrors effect.



Specification link

Proposal in a personal repository, no adoption from community

Status in Chromium


No active development (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

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Intent to Prototype url

Intent to Prototype thread

Last updated on 2022-01-15