HTML API: Optimize low-level parsing details. #7270

Job	Run time
Core running from build / Core running from build / Linux	2m 11s
Core running from src / Core running from src / Linux	1m 58s
Core running from build / Core running from build / Windows	3m 27s
Core running from src / Core running from src / Windows	3m 12s
Core running from build / Core running from build / MacOS	2m 3s
Core running from src / Core running from src / MacOS	1m 49s
Gutenberg running from build / Gutenberg running from build / Linux	8m 32s
Gutenberg running from src / Gutenberg running from src / Linux	8m 28s
Gutenberg running from build / Gutenberg running from build / Windows	12m 37s
Gutenberg running from src / Gutenberg running from src / Windows	11m 25s
Gutenberg running from build / Gutenberg running from build / MacOS	7m 33s
Gutenberg running from src / Gutenberg running from src / MacOS	7m 58s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 11m 13s

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