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    <p>Transparent isn't really a color. So, you can't animate to it. You might be able to achieve the effect you're looking for by using a separate element for the background, and animating the opacity though.</p> <h3>Example:</h3> <p>HTML:</p> <pre><code>&lt;body style="background-color:yellow"&gt; &lt;!-- by default, "see through" to parent's background color --&gt; &lt;div id="container"&gt; Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean nec magna. Nulla eu mi sit amet nibh pellentesque vehicula. Vivamus congue purus non purus. Nam cursus mollis lorem. &lt;/div&gt; &lt;/body&gt; </code></pre> <p>Script:</p> <pre><code>// on load... $(function() { var container = $("#container"); container .hover( // fade background div out when cursor enters, function() { $(".background", this).stop().animate({opacity:0}); }, // fade back in when cursor leaves function() { $(".background", this).stop().animate({opacity:1}) }) // allow positioning child div relative to parent .css('position', 'relative') // create and append background div // (initially visible, obscuring parent's background) .append( $("&lt;div&gt;") .attr('class', 'background') .css({ backgroundColor:'blue', position: 'absolute', top:0, left:0, zIndex:-1, width:container.width(), height:container.height() }) ); }); </code></pre> <hr> <p>Kingjeffrey's comment points out that this answer is somewhat outdated - browsers do now support RGBA color values, so you <em>can</em> animate just the background. However, jQuery doesn't support this in core - you'll need a <a href="http://pioupioum.fr/sandbox/jquery-color/" rel="nofollow noreferrer">plugin</a>. See also: <a href="https://stackoverflow.com/questions/3242368/jquery-rgba-color-animations">jQuery + RGBA color animations</a></p>
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    1. POHow do I animate a background color to transparent in jQuery?
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    1. CONice, clean and elegant.
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    2. COYour statement "Transparent isn't really a color" may be true in color theory, but it is not accurate when describing how browsers handle the 'transparent' keyword. Browsers treat 'transparent' as black with 0% opacity. This becomes particularly important when working with gradients. If you create a CSS3 gradient between white and transparent, you will see some grey creeping in (because it transitions the color to black and the opacity to 0). To avoid the unwanted grey, set your gradient for white to rgba(255,255,255,0).
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