I should also say, regardless of which HTML element your header is in, you can and should always consider it in connection with all other headers on the page - in terms of heading hierarchy you consider the page as a whole. Again, it helps a screen reader user scan the content the same way a sighted user would.
Using those additional semantic elements give your page other accessibility boosts, so definitely keep using them too!
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I should also say, regardless of which HTML element your header is in, you can and should always consider it in connection with all other headers on the page - in terms of heading hierarchy you consider the page as a whole. Again, it helps a screen reader user scan the content the same way a sighted user would.
Using those additional semantic elements give your page other accessibility boosts, so definitely keep using them too!