A doctype declaration refers to the rules for the markup language, so that the browsers render the content correctly.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/XHTML11/DTD/XHTML11.dtd">
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