[mediacapture-region] Definition of valid CropTarget might be too loose (#29)

youennf has just created a new issue for https://github.com/w3c/mediacapture-region:

== Definition of valid CropTarget might be too loose ==
A CropTarget is defined in terms of browsing context which can potentially outlive navigations.
I believe it would be best handled in terms of active document of the top level browsing context instead.
This will ensure that if a CropTarget of a previous document of the same browsing context is used, it is not considered valid.

Please view or discuss this issue at https://github.com/w3c/mediacapture-region/issues/29 using your GitHub account


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