Check that internal keywords at the beginning of a stylesheet don't break CSS parsing. They should not inhibit further stylesheet parsing.

Test for @-internal-rule. This text should be green

Test for @-internal-decls. This text should be green

Test for @-internal-value. This text should be green

Test for @-internal-selector. This text should be green

Test for @-internal-medialist. This text should be green

Test for @-internal-keyframe-rule. This text should be green

Test for @-internal-keyframe-key-list. This text should be green

Test for @-internal-supports-condition. This text should be green

Test for @invalid-rule-without-reserved-keyword. This text should be green