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    <p>Your mileage will vary depending on browser and version, but here's the short of it:</p> <p>To the best of my knowledge, browsers don't actually go to any effort to fetch and make use of the dtd in the URL, or validate the code in any way. Resultingly, your webpage will work "fine" without a doctype declaration, with a broken doctype declaration, and in a number of other broken forms. </p> <p>When not running your code through a validator, the major reason for providing a doctype definition at the top of your code is to pull browsers out of quirks mode and into standards compliance mode, ala the historical disaster with IE &lt; 7 ... </p> <p><em>It's a little bit outside of the scope to lecture on quirks and standards mode here, so the curious should head over to wikipedia: <a href="http://en.wikipedia.org/wiki/Quirks_mode" rel="nofollow">http://en.wikipedia.org/wiki/Quirks_mode</a></em></p> <p>Web browsers use their own relatively arbitrary standards to switch modes based on the doctype. What you are likely encountering is IE in <strong>quirks mode</strong> when your DTD lacks a URL, and <strong>standards mode</strong> when you add the URL.</p> <p>You should probably aim to include the full declaration, including the URL, and run your code through the W3C validator [1] for good measure.</p> <p>Fix the rendering problems with valid code and a full doctype [2]. Quirks mode was only ever intended for backwards compatibility so that unmaintained websites will continue to render as expected for as long as possible.<br> If your web page only renders as expected in quirks mode, <strong>your web page is broken</strong>.</p> <p><strong>Sidenote: you should seriously question why you are using 4.01 transitional in 2013.</strong></p> <p>[1] <a href="http://validator.w3.org/" rel="nofollow">http://validator.w3.org/</a> <br> [2] <a href="http://www.w3.org/QA/2002/04/valid-dtd-list.html" rel="nofollow">http://www.w3.org/QA/2002/04/valid-dtd-list.html</a></p>
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    1. POWhat's default DTD if not mentioned in doctype declaration?
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    1. COFirst of all, thanks a lot for your answer, @Kiirani. I am working on a legacy web project which was developed around 10 years ago, so you know I cannot avoid using 4.01 transitional doctype as it's defined in the page template for the whole web site consistently.
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    2. COI just created a static html and tested the possible behavior of IE you've mentioned, you're right about that. If lack of DTD URL, IE is in quirks mode and otherwise in standard mode. My testing is in IE8. However, for now, I cannot modify the doctype to include the URL, since it will break the page rendering, especially table elements...
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