HTML API: Add CSS selector support #12399

Job	Run time
Core running from build / Core running from build / Linux	2m 5s
Core running from src / Core running from src / Linux	2m 0s
Core running from build / Core running from build / Windows	3m 42s
Core running from src / Core running from src / Windows	4m 10s
Core running from build / Core running from build / MacOS	2m 4s
Core running from src / Core running from src / MacOS	1m 59s
Gutenberg running from build / Gutenberg running from build / Linux	9m 7s
Gutenberg running from src / Gutenberg running from src / Linux	8m 40s
Gutenberg running from build / Gutenberg running from build / Windows	12m 0s
Gutenberg running from src / Gutenberg running from src / Windows	12m 33s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 9s
Gutenberg running from src / Gutenberg running from src / MacOS	8m 25s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 14m 54s

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