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    <p>It shouldn't have any effect upon the performance really. Seeing <strong>firefox's CSS parser at <a href="http://mxr.mozilla.org/mozilla2.0/source/layout/style/nsCSSDataBlock.cpp#572" rel="noreferrer"><code>/source/layout/style/nsCSSDataBlock.cpp#572</code></a></strong> and I think that is the relevant routine, handling <strong>overwriting</strong> of CSS rules.</p> <p>it just seems to be an simple check for "important".</p> <pre><code> if (aIsImportant) { if (!HasImportantBit(aPropID)) changed = PR_TRUE; SetImportantBit(aPropID); } else { // ... </code></pre> <p>Also, comments at <strong><a href="http://mxr.mozilla.org/mozilla2.0/source/layout/style/nsCSSDataBlock.h#219" rel="noreferrer"><code>source/layout/style/nsCSSDataBlock.h#219</code></a></strong></p> <pre><code> /** * Transfer the state for |aPropID| (which may be a shorthand) * from |aFromBlock| to this block. The property being transferred * is !important if |aIsImportant| is true, and should replace an * existing !important property regardless of its own importance * if |aOverrideImportant| is true. * * ... */ </code></pre> <hr> <blockquote> <ol> <li><p>Firefox uses a top down parser written manually. In both cases each CSS file is parsed into a StyleSheet object, each object contains CSS rules.</p></li> <li><p>Firefox then creates style context trees which contain the end values (after applying all rules in the right order)</p></li> </ol> </blockquote> <p><img src="https://i.stack.imgur.com/OE5Gq.png" alt="CSS Parser Firefox"></p> <p><strong><a href="http://taligarsiel.com/Projects/howbrowserswork1.htm#CSS_parsing" rel="noreferrer">From: http://taligarsiel.com/Projects/howbrowserswork1.htm#CSS_parsing</a></strong></p> <p>Now, you can easily see, in such as case with the Object Model described above, the parser can mark the rules affected by the <code>!important</code> easily, without much of a subsequent cost. Performance degradation <strong>is not</strong> a good argument against <code>!important</code>.</p> <p><strong>However, maintainability does take a hit (as other answers mentioned), which might be your only argument against them.</strong></p>
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    1. POIs !important bad for performance?
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    1. USAnirudh Ramanathan
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    1. COI like that you're the only one who bothered checking instead of assuming. Great work sir!
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      1. USMoox
    2. CO+1 for breaking out the Firefox source code. Über.
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    3. COThis object model is not the DOM, by the way... it's the CSSOM. Just in case anybody's wondering.
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      1. USBoltClock
 

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