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    copied!<p>In what browsers are you testing this?</p> <p>Another answer refers to the <code>&lt;!DOCTYPE&gt;</code> HTML tag. You must understand the importance of this tag. Any web browser will open .HTML or .HTM document, but the only way the browser actually knows the author's intended format of the file is to include this <code>&lt;!DOCTYPE&gt;</code> tag. Starting out, I did not realize this fact.</p> <p>So who cares? Well, it matters whether the browser is identifying your file as HTML4, <code>transitional</code> XHTML, <code>strict</code> HTML5, and so on. For instance, a browser might automatically identify documents which lack a <code>&lt;!DOCTYPE&gt;</code> as HTML4 (because that attribute did not exist until later). I believe this means that the browser would ignore CSS formatting.</p> <p>In short, learn what HTML doctypes are and make sure to use one that supports most or all of what you're trying to use. Hopefully, you can find a happy medium with one of the doctype options, but you may very well have to alter some of your code. Good luck!</p> <p>EDIT: You have to test whatever you're developing in all of the major browsers. To be specific, the reason for this is that each browser has behavior/interpretation differences. You will often be sorely disappointed if you forget to test in multiple browsers during an hour of coding. LoL it's not fun to find out your code is broken in 3 out of 5 browsers, and that it would have been much easier to fix as you were first writing it an hour ago. These are words to code by: test as you go, and test widely.</p>
 

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