HTML API: Add CSS selector parsing #12105

Job	Run time
Core running from build / Core running from build / Linux	1m 22s
Core running from src / Core running from src / Linux	1m 57s
Core running from build / Core running from build / Windows	1m 58s
Core running from src / Core running from src / Windows	1m 59s
Core running from build / Core running from build / MacOS	1m 59s
Core running from src / Core running from src / MacOS	1m 24s
Gutenberg running from build / Gutenberg running from build / Linux	2m 3s
Gutenberg running from src / Gutenberg running from src / Linux	2m 3s
Gutenberg running from build / Gutenberg running from build / Windows	1m 55s
Gutenberg running from src / Gutenberg running from src / Windows	2m 0s
Gutenberg running from build / Gutenberg running from build / MacOS	1m 23s
Gutenberg running from src / Gutenberg running from src / MacOS	1m 27s
Slack Notifications	1s
Failed workflow tasks	1s
	21m 32s

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