[css-animations][css-transitions] Actually, since we don't have init*Event, there's no point worrying about document.createEvent, so so we can just put the defaults in the init dict.
[css-text-decor] Attempt to clarify underline position calculations.

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extra : rebase_source : 235927c0c811bf9ec78a9f90e93499177439b2e9
[css-syntax] typo

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extra : rebase_source : 42674bcdca1546e0658b1b1c91519755749e9379