HTML API: Add CSS selector support #12521

Job	Run time
Core running from build / Core running from build / Linux	2m 3s
Core running from src / Core running from src / Linux	1m 54s
Core running from build / Core running from build / Windows	3m 21s
Core running from src / Core running from src / Windows	3m 52s
Core running from src / Core running from src / MacOS	1m 44s
Core running from build / Core running from build / MacOS	1m 49s
Gutenberg running from build / Gutenberg running from build / Linux	8m 50s
Gutenberg running from src / Gutenberg running from src / Linux	8m 49s
Gutenberg running from build / Gutenberg running from build / Windows	3m 56s
Gutenberg running from src / Gutenberg running from src / Windows	4m 12s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 29s
Gutenberg running from src / Gutenberg running from src / MacOS	9m 42s
Slack Notifications	0s
Failed workflow tasks	0s
	58m 41s

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