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    <p>A technique that works is to look at the computed style of the element. This is supported in Opera and Firefox (and I recon in safari, but haven't tested). IE (7 at least), provides a method to get a style, but it seems to be whatever was in the stylesheet, not the computed style. More details on quirksmode: <a href="http://www.quirksmode.org/dom/getstyles.html" rel="nofollow noreferrer">Get Styles</a></p> <p>Here's a simple function to grab the font used in an element:</p> <pre><code>/** * Get the font used for a given element * @argument {HTMLElement} the element to check font for * @returns {string} The name of the used font or null if font could not be detected */ function getFontForElement(ele) { if (ele.currentStyle) { // sort of, but not really, works in IE return ele.currentStyle["fontFamily"]; } else if (document.defaultView) { // works in Opera and FF return document.defaultView.getComputedStyle(ele,null).getPropertyValue("font-family"); } else { return null; } } </code></pre> <p>If the CSS rule for this was:</p> <pre><code>#fonttester { font-family: sans-serif, arial, helvetica; } </code></pre> <p>Then it should return helvetica if that is installed, if not, arial, and lastly, the name of the system default sans-serif font. Note that the ordering of fonts in your CSS declaration is significant.</p> <p>An interesting hack you could also try is to create lots of hidden elements with lots of different fonts to try to detect which fonts are installed on a machine. I'm sure someone could make a nifty font statistics gathering page with this technique.</p>
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    1. COThis returns the full string of the css like "Helvetica,Arial,sans-serif". It doesn't return the actual font being used.
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