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Spec: CSS Conditional Rules Module Level 3 https://www.w3.org/TR/css-conditional-3/
Tests: https://github.com/web-platform-tests/wpt/tree/master/css/css-conditional
Now it passes all non-javascript tests in https://github.com/web-platform-tests/wpt/tree/master/css/css-conditional
except "at-supports-040.html" that is for the Level 4
selector(...)
not supported yetand "css-supports-042.xht" that is an edge case that Chromium also fails.
resolves #730