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1301bcdf10
If omitting the universal selector in the serialization is possible, we should do it so we obtain a shorter serialization (to match the behavior asserted in cssom/serialize-namespaced-type-selectors.html). For example, if someone writes *|*::before and there is no default namespace, we should serialize to ::before; however, if there is a default namespace, we should serialize to *|*::before. (This is the test case "Universal selector in any namespace followed by pseudo element). This matches the behavior implemented by WebKit; that one case in particular isn't implemented by Gecko, but other cases where the universal selector should be elided are implemented by Gecko but were not previously by Servo.