The tags should reflect the content and only the content. The post is only about HTML & CSS. The fact that HTML is related to react, JS, Boostrap, Vue, Angular, etc etc is irrelevant to the tagging system.
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I think there is no problem on adding those tags. Also in React, you can use these HTML tags in JSX.
The tags should reflect the content and only the content. The post is only about HTML & CSS. The fact that HTML is related to react, JS, Boostrap, Vue, Angular, etc etc is irrelevant to the tagging system.