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    <p>This is the perennial problem. The best you can do is:</p> <ol> <li>Use a <code>DOCTYPE</code>. It doesn't much matter what <code>DOCTYPE</code> you use, but use one. This tells the browser to use its standards-compliant mode. (The degree to which it will actually <em>be</em> standards-compliant will vary, but it tells the browser to at least try.)</li> <li>Make sure your pages <a href="http://validation.w3.org" rel="nofollow">validate</a> according to that <code>DOCTYPE</code> (or at least <em>mostly</em> validate; if you're using an older <code>DOCTYPE</code> but need custom attributes, they won't validate).</li> <li>Decide which browsers you will support. I don't mean you're not shooting for complete compatibility, but you have limited resources (see next point). So find out what your target audience use, and draw a line somewhere. Net Applications and StatCounter have browser statistics pages <a href="http://marketshare.hitslink.com/browser-market-share.aspx?qprid=2" rel="nofollow">here</a> and <a href="http://gs.statcounter.com/" rel="nofollow">here</a>, and they likely represent different audiences; they may be a place to start, but of course the gold standard is your own logs.</li> <li><strong>Test, test, test</strong> with your target browsers. Not at the end, when you have things all pretty in your preferred browser; <em>throughout the development cycle</em> so you don't go too far down a path and then find that that just won't work in something you need to support. </li> </ol>
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