Import https://github.com/web-platform-tests/wpt/tree/master/css/css-conditional tests.
Created attachment 407601 [details] Patch
This patch modifies the imported WPT tests. Please ensure that any changes on the tests (not coming from a WPT import) are exported to WPT. Please see https://trac.webkit.org/wiki/WPTExportProcess
Committed r266356: <https://trac.webkit.org/changeset/266356> All reviewed patches have been landed. Closing bug and clearing flags on attachment 407601 [details].
<rdar://problem/68082116>