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Do HTML 5 tags appearing in HTML 4 Transitional cause a performance issue? Will it validate?
Current doctype declaration:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
HTML 5 tags used:
<section> <header> <nav>
No more so then if they appear in HTML 5.
No, of course not. They weren’t added until HTML 5.