The doctype declaration isn't exactly content in the sense of the word.
There isn't any content that is supposed to exist outside head
and body
(and in fact, any content that's meant to display should only exist inside body
). Browsers can create some pretty wacky DOMs when you give them strange or invalid markup, however. Here's an example.
Also, head
and body
, in that order, are the only two possible children of html
, the root element.
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