What does <!doctype html> do?
What does this tag do?
What I can see is that with this tag on top my html behaves in another way than without. How do I k
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The doctype declaration should be the very first thing in an HTML document, before the tag.
The doctype declaration is not an HTML tag; it is an instruction to the web browser about what version of the markup language the page is written in.
The doctype declaration refers to a Document Type Definition (DTD). The DTD specifies the rules for the markup language, so that the browsers render the content correctly.
Quote from here: http://www.w3schools.com/tags/tag_doctype.asp
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