Test [smoke]

Fix inconsistent flow for `B, Strong, Em, I` tags, add support `<h4-6>` javadoc html tags #2548

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Run time

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Job	Run time
test-matrix (ubuntu-latest)	20m 31s
test-matrix (windows-latest)	29m 29s
test-matrix (macos-latest)	29m 13s
	1h 19m 13s