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copied!<p>As far as I know, in HTML <strong>scripts are parsed sequentially</strong> (unless they have defer attribute, but that's another story). </p> <p>If you look at <a href="http://www.w3.org/TR/1999/REC-html401-19991224/interact/scripts.html#h-18.1" rel="nofollow noreferrer">SCRIPT section in HTML4.01 specs</a>, you can see that:</p> <blockquote> <p>Scripts may be evaluated as a document loads to modify the contents of the document dynamically.</p> </blockquote> <p>and that:</p> <blockquote> <p>All SCRIPT elements are evaluated in order as the document is loaded.</p> </blockquote> <p>There's also an example of how the following script would affect resulting markup:</p> <pre><code> <TITLE>Test Document</TITLE> <SCRIPT type="text/javascript"> document.write("<p><b>Hello World!<\/b>") </SCRIPT> </code></pre> <p>Has the same effect as this HTML markup:</p> <pre><code> <TITLE>Test Document</TITLE> <P><B>Hello World!</B></P> </code></pre> <p>Since your script is contained right after BODY and has no DEFER attribute, it's probably safe to assume that during script execution, <strong>BODY tag is already parsed and BODY element is already created</strong> (but not the rest of the tree, such as elements created from the markup following script in question!).</p> <p>And, of course, you should really <strong>use faster, more compatible and shorter <code>document.body</code></strong> rather than <code>document.getElementsByTagName('body')[0]</code> :)</p> <p>In fact, I would replace this whole chunk:</p> <pre><code>(function() { var body = document.getElementsByTagName('body'); if ( body && body[0] ) { body[0].className = body[0].className.replace(/no_javascript/, "javascript"); } })(); </code></pre> <p>with something like:</p> <pre><code>document.body.className = document.body.className.replace('no_javascript', 'javascript'); </code></pre>

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