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Is it considered okay (standards-wise) to mix HTML 4 and HTML 5?

I'm basically wondering wether or not it's considered okay (standards wise) to mix HTML 4 and HTML 5.

For instance, what if I have an HTML 4 body element with an HTML5 audio tag in it. I know it works and renders properly, but is it okay standards-wise, and will my SEO value be penalized by it?

Edit As a lot of posts pointed out, HTML 5 has a body element too. Apparently, only a few elements are deprecated and marked as obsolete every time a new HTML standard arrives. Please don't downvote my question now, since I think there are others misunderstanding this too. That way, I don't have to delete it.

Solution

  • The elements you specified are both HTML 5, hence you aren't mixing anything.

    (If you give a better example of perhaps what issue you're facing, or which elements you are thinking of, perhaps we can elaborate.)

    Using HTML 4 elements is safe in HTML 5, since new elements are introduced and only a few deprecated ones were dropped.