Re: [w3c/manifest] Forbid browser to take screenshots (#661)

Such an API could only be offered on a best-effort basis. Some platforms (most?) won't support it. It can always be worked around by using another browser that doesn't support the feature. On Desktop platforms, you can't really prevent screen-capturing tools from capturing the entire desktop (unless maybe you dig deep into a DRM-video pipeline).

I worry that a) this may be used to stop the user doing what they want (not just preventing sensitive information from getting out, but also as a form of DRM, perhaps triggering a new EME debate), and b) this may lull users into a false sense of security; e.g., trusting that when they send a "self-destructing" message, the recipient will be unable to screenshot it, when in practice there will be lots of ways around it.

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