[csswg-drafts] Pull Request: [cssom] Let getComputedStyle return an empty style for invalid pseudo-elements, and the element's style if the string doesn't begin with a colon.

emilio has just submitted a new pull request for https://github.com/w3c/csswg-drafts:

== [cssom] Let getComputedStyle return an empty style for invalid pseudo-elements, and the element's style if the string doesn't begin with a colon. ==
Fixes #6501.

Tests in https://github.com/web-platform-tests/wpt/pull/30140.

See https://github.com/w3c/csswg-drafts/pull/6540


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