Correctly: almost all of them were removed from the HTML spec many years ago (but not <object>, that's still a valid HTML5 element).
But: invalid according to the spec doesn't mean it won't do something in a browser, browsers aren't pure spec implementations, they're applications used by humans to view content made by humans =)
But: invalid according to the spec doesn't mean it won't do something in a browser, browsers aren't pure spec implementations, they're applications used by humans to view content made by humans =)