HTML API: Add CSS selector support #12480

Job	Run time
Core running from build / Core running from build / Linux	2m 8s
Core running from src / Core running from src / Linux	1m 53s
Core running from build / Core running from build / Windows	4m 26s
Core running from src / Core running from src / Windows	4m 24s
Core running from build / Core running from build / MacOS	2m 14s
Gutenberg running from build / Gutenberg running from build / Linux	8m 30s
Core running from src / Core running from src / MacOS	1m 53s
Gutenberg running from src / Gutenberg running from src / Linux	9m 4s
Gutenberg running from build / Gutenberg running from build / Windows	12m 13s
Gutenberg running from src / Gutenberg running from src / Windows	12m 19s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 52s
Gutenberg running from src / Gutenberg running from src / MacOS	8m 17s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 16m 13s

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