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    <p><strong>EDIT/ADDENDUM:</strong> Just realized you are trying to dig into the specifics of how <code>getComputedStyle()</code> on IE9 versus other browsers. So caveat if this script is not what you are looking for since it seems to simply test for the existence of <code>getComputedStyle()</code> and not specific selection options. </p> <p><a href="http://www.sitepoint.com/forums/showthread.php?289765-getComputedStyle-not-working-in-Safari-1-3-2-0" rel="nofollow">This site</a> seems to offer a solution to detecting <code>getComputedStyle</code> across browsers. Specifically this code near the bottom of the page:</p> <pre><code>&lt;script type="text/javascript"&gt; // First paramter is a nodes id, second the CSS property you want function getCSSProperty(sNodeId, sProperty) { var oNode = document.getElementById(sNodeId); if(document.defaultView) { return document.defaultView.getComputedStyle(oNode, null).getPropertyValue(sProperty); } else if(oNode.currentStyle) { var sProperty = sProperty.replace(/-\D/gi, function(sMatch) { return sMatch.charAt(sMatch.length - 1).toUpperCase(); }); return oNode.currentStyle[sProperty]; } else return null; } alert(getCSSProperty("myDiv", "margin-bottom")); &lt;/script&gt; </code></pre> <p><strong>EDIT:</strong> The original poster has a question about the regular expression logic and this is my attempt to explain. If I am wrong, please let me know or comment on what you think it is:</p> <pre><code> var sProperty = sProperty.replace(/-\D/gi, function(sMatch) { return sMatch.charAt(sMatch.length - 1).toUpperCase(); }); </code></pre> <p>Okay, that chunk of code is doing a regular expression replace with the actual regular expression being <code>/-\D/gi</code>. Using <a href="http://www.cs.tut.fi/~jkorpela/perl/regexp.html" rel="nofollow">this guide to regular expressions</a> (aka: regex) I think I understand it.</p> <p>The <code>/</code> are delimiters; the magic happens between them. The <code>-</code> is simply matching a dash. The <code>\D</code> is a special notation that means, “matches any non-digit character”. And the <code>gi</code> is specific to the regex call and <a href="http://www.cprenterprisesonline.com/elearning/jsref/jsref_regexp_modifier_gi.asp.htm" rel="nofollow">explained here</a> as: “The <code>gi</code> modifier is used to do a case insensitive search of all occurrences of a regular expression in a string.”</p> <p>The nested function acts on a matches in the <code>replace</code> regex and basically does a <code>.toUpperCase()</code> on matches.</p> <p>So it seems that you might be able to adapt this to match deeper functionality you are trying to detect? </p>
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    1. POHow to check if a browser fully supports a javascript method (eg, getComputedStyle pseudo elements)
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    1. COCan you explain what the regular Expression is doing? It seems like if that were to work, I would only need the code within the if(oNode.currentStyle) block.
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    2. COAdded an explanation of the regular expression as I understand it.
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    3. COthanks for the explanation.
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