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Support screen.width/height/availWidth/availHeight using information from glutin. r?@paulrouget
Since glutin don't have `availWidth` and `availHeight` information, I let them fallback to `width` and `height`. If that's not acceptable in terms of webcompat, I can remove that part.
There are some test failures on wpt css about mutating screen.width/height should throw exception, but I can't reproduce that behavior on other major browser, so I keep them disabled. Also there are some media query issues, but I believe that's due to some test harness problem on my test machine.
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Source-Repo: https://github.com/servo/servo
Source-Revision: 504ad4de2a426c2bc70161a9190fddaa8728ead2
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