Timo 86f96a1a28 fix(challenges): Revert CSS regex test
Some CSS tests were changed to regex tests while the CSS tests weren't
working on Firefox. Now that the original issue has been fixed, these
changes can be reverted.

Closes #15567
2017-08-30 14:56:09 +02:00
2015-08-27 16:37:01 -07:00
2016-12-30 16:47:09 -06:00
Description
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