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copied!<p>Lets take a look at the W3C HTML5 definition, they have a conveniënt page about the differences HTML5 brings: <a href="http://www.w3.org/TR/html5-diff/#doctype" rel="nofollow">http://www.w3.org/TR/html5-diff/#doctype</a></p> <blockquote> <p>2.2 The Doctype</p> <p>The HTML syntax of HTML5 requires a doctype to be specified to ensure that the browser renders the page in standards mode. The doctype has no other purpose. [DOCTYPE]</p> <p>The doctype declaration for the HTML syntax is and is case-insensitive. Doctypes from earlier versions of HTML were longer because the HTML language was SGML-based and therefore required a reference to a DTD. <strong>With HTML5 this is no longer the case</strong> and the doctype is only needed to enable standards mode for documents written using the HTML syntax. Browsers already do this for .</p> <p>To support legacy markup generators that cannot generate the preferred short doctype, the doctype is allowed in the HTML syntax.</p> <p>The strict doctypes for HTML 4.0, HTML 4.01, XHTML 1.0 as well as XHTML 1.1 are also allowed (but are discouraged) in the HTML syntax.</p> <p>In the <strong>XML syntax</strong>, any doctype declaration may be used, or it <strong>may be omitted altogether</strong>. Documents with an XML media type <strong>are always handled in standards mode</strong>.</p> </blockquote> <p>On that page, chapter 1 (Introduction) says more about HTML versus XML syntax:</p> <blockquote> <p>The HTML5 draft (..) defines a single language called HTML which can be written in <strong>HTML</strong> syntax and in <strong>XML</strong> syntax.</p> </blockquote> <p>So, if your HTML5 is strict XML syntax, i can conclude from the last paragraph that yes in this case you should not prefix a doctype line.</p> <p>See chapter 2 for the difference in syntax:</p> <p>HTML5 <strong>HTML</strong> syntax:</p> <pre><code><!doctype html> <html> <head> <meta charset="UTF-8"> <title>Example document</title> </head> <body> <p>Example paragraph</p> </body> </html> </code></pre> <p>HTML5 <strong>XML</strong> syntax:</p> <pre><code><?xml version="1.0" encoding="UTF-8"?> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Example document</title> </head> <body> <p>Example paragraph</p> </body> </html> </code></pre> <p>There is some subtle differences in syntax.</p>

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