Treat "::-webkit-whatever-stuff" as valid CSS selectors.


Link to standard:
* (previous discussion of this 

Platform coverage: All platforms

Estimated or target release: maybe 64

Preference behind which this will be implemented: 

Is this feature enabled by default in sandboxed iframes? Yes.

DevTools bug: Do we need one?

Do other browser engines implement this?
WebKit and Blink have this behavior for long, and it causes compat issue for us.

web-platform-tests: A new web-platform-test is being added as part of the 
implementing bug.

Is this feature restricted to secure contexts?
No, because this doesn't provide any additional functionality, it's purely 
treating something previously invalid as valid without actually do anything 
with them.
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