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    <p>As described in the <a href="http://www.w3.org/TR/SVG/animate.html#SetElement" rel="nofollow">SVG 1.1 Specification</a>:</p> <blockquote> <p>The ‘set’ element provides a simple means of <strong>just setting</strong> the value of an attribute <strong>for a specified duration</strong>.<br> …<br> <code>to = "&lt;value&gt;"</code> Specifies the value for the attribute <strong>during the duration of the ‘set’ element</strong>.</p> </blockquote> <p>(Emphasis mine.)</p> <p>As you can see, the <code>duration</code> of the <code>&lt;set&gt;</code> element is not a transition time, but rather how long the effect is to be applied. If you remove the <code>end</code> attribute you'll see the color change from red to green for 1 second <a href="http://jsfiddle.net/4xx5p/1/" rel="nofollow">and then revert</a> to the original value.</p> <p>For more details, read about the <code>&lt;set&gt;</code> element in the <a href="http://www.w3.org/TR/2001/REC-smil-animation-20010904/#setElement" rel="nofollow">SMIL Specification</a>.</p> <hr> <p><strong>Edit</strong>: Here's an example of using custom data to annotate your SVG elements and a run-once script that uses that data to create the <code>&lt;animate&gt;</code> elements you want, based on the fill of the elements. You can view this example live at <a href="http://phrogz.net/svg/change-color-on-hover.svg" rel="nofollow">http://phrogz.net/svg/change-color-on-hover.svg</a></p> <pre><code>&lt;svg xmlns="http://www.w3.org/2000/svg" xmlns:y="yasashiku" viewBox="0 0 240 150"&gt; &lt;title&gt;Change Color on Hover&lt;/title&gt; &lt;style&gt; circle { stroke:black; stroke-width:2px } circle:not([fill]) { fill:purple } &lt;/style&gt; &lt;circle cx="50" cy="50" r="40" fill="red" y:hoverAnimFillTo="blue" y:hoverAnimDur="0.3s" /&gt; &lt;circle cx="100" cy="100" r="40" fill="red" y:hoverAnimFillTo="green" y:hoverAnimDur="1s" /&gt; &lt;circle cx="150" cy="42" r="40" fill="orange" y:hoverAnimFillTo="yellow" /&gt; &lt;circle cx="200" cy="100" r="40" y:hoverAnimFillTo="steelblue" /&gt; &lt;script&gt; var els = document.getElementsByTagName('*'), y = 'yasashiku'; for (var i=els.length;i--;){ var fillColor = els[i].getAttributeNS(y,'hoverAnimFillTo'); if (fillColor){ var dur = els[i].getAttributeNS(y,'hoverAnimDur') || '0.1s'; createOn(els[i],'animate',{ begin:'mouseover', attributeType:'CSS', attributeName:'fill', to:fillColor, dur:dur, fill:'freeze' }); createOn(els[i],'animate',{ begin:'mouseout', attributeType:'CSS', attributeName:'fill', to:els[i].getAttribute('fill') || computedStyle(els[i],'fill'), dur:dur, fill:'freeze' }); } } function createOn(el,name,attrs){ var e = el.appendChild(document.createElementNS(el.namespaceURI,name)); for (var name in attrs) e.setAttribute(name,attrs[name]); return e; } function computedStyle(el,name){ return document.defaultView.getComputedStyle(el,null)[name]; } &lt;/script&gt; &lt;/svg&gt; </code></pre>
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    1. COThanks; any thoughts on how I could revert back without a priori knowledge of the initial color?
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    2. CO@yasashiku Personally, I'd just JS to either control the colors or (simpler) dynamically create the `<animate>` elements based on the attributes. If this is an option for you (if JS is available) and you need help with it, I can amend my answer with details.
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    3. CO…nevermind, I've created an example and edited the question anyhow. Hopefully this helps.
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