HTML API: Add support for BUTTON element #24588

Job	Run time
7.0 on ubuntu-latest	8m 45s
7.0 multisite on ubuntu-latest	9m 35s
7.1 on ubuntu-latest	6m 51s
7.1 multisite on ubuntu-latest	7m 49s
7.2 on ubuntu-latest	8m 33s
7.2 multisite on ubuntu-latest	7m 48s
7.3 on ubuntu-latest	7m 13s
7.3 multisite on ubuntu-latest	11m 18s
7.4 on ubuntu-latest	9m 24s
7.4 multisite on ubuntu-latest	9m 51s
8.0 on ubuntu-latest	9m 49s
8.0 multisite on ubuntu-latest	8m 7s
8.1 on ubuntu-latest	9m 49s
8.1 multisite on ubuntu-latest	9m 47s
8.2 on ubuntu-latest	8m 49s
8.2 multisite on ubuntu-latest	11m 0s
7.4 with memcached on ubuntu-latest	10m 24s
7.4 multisite with memcached on ubuntu-latest	8m 13s
Slack Notifications	0s
Failed workflow tasks	0s
	2h 43m 5s

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