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    <p>My solution to triggering JavaScript at the exact same time as media queries (even in the face of device or browser quirks as seen here) is to trigger my <code>window.resize</code> logic in response to a change that the media query made. Here's an example:</p> <p><strong>CSS</strong></p> <pre><code> #my-div { width: 100px; } @media all and (max-width: 966px) { #my-div { width: 255px; } } </code></pre> <p><strong>JavaScript</strong></p> <pre><code> var myDivWidth; $(document).ready(function() { myDivWidth = $('#myDiv').width(); $(window).resize(function () { if ($('#myDiv').width() != myDivWidth) { //If the media query has been triggered myDivWidth = $('#myDiv').width(); //Your resize logic here (the jQuery menu stuff in your case) } }); }); </code></pre> <p>In this example, whenever <code>#myDiv</code> changes size (which will occur when the media query is triggered), your jQuery resize logic will also be run.</p> <p>For simplicity I used an element width, but you could easily use whatever property you are changing, such as the <code>body</code> background.</p> <p>Another advantage of this approach is that it keeps the <code>window.resize</code> function as lightweight as possible, which is always good because it is called every single time the window size changes by a single pixel (in most modern browsers anyway).</p> <p>The bug that you encountered seems to me to be a browser-specific problem, as you said. Although it seems incorrect intuitively, Firefox (and other browsers with the issue) actually seems to match the <a href="http://www.w3.org/TR/css3-mediaqueries/" rel="noreferrer">W3C recommendation for media queries</a> more closely than the Webkit browsers. The recommendation states that the viewport width includes scrollbars, and JavaScript window width does not seem to include scrollbars, hence the disrepancy.</p>
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    1. POHow do I get CSS mediaqueries to work with jQuery $(window).innerWidth()?
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    1. USDrew Gaynor
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    1. COThanks a lot! Although it's a workaround it sure is helpful advice, because now users will experience no difference.
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      1. USSimon
    2. CO@Simon: Glad I could help. It certainly is frustrating though that the media query and JavaScript definitions of width don't always agree.
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    3. CO@Simon You should mark Jackie's answer as correct (tick next to it)
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