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    <p>In your case, the "jump" you notice in your animation comes from the change of animations you have installed on onmouseup. The "Bounce-Out" Animation has an initial scale of 1 (first Keyframe), and this is what the two circles immediately get set to when the animation is installed.</p> <p>There are two solutions to this, which I can explain in some detail: </p> <p><br/></p> <h2>The Easy Way</h2> <p>You could just wait for the initial animation to end via the 'webkitAnimationEnd' Event and install the onmouseup event with a recursive function waiting for the animation to finish:</p> <pre><code>var initAnimationEnded = false; document.getElementById('sports').addEventListener('webkitAnimationEnd', function() { initAnimationEnded = true; }, false);​ </code></pre> <p>And here's the onmouseup handler:</p> <pre><code>document.getElementById('games').onmouseup = function() { function bounceOut() { if (initAnimationEnded) { events.style.webkitAnimationName = "Bounce-Out"; sports.style.webkitAnimationDelay = "0.2s"; sports.style.webkitAnimationName = "Bounce-Out"; } else { setTimeout(bounceOut, 20); } } bounceOut(); } </code></pre> <p><br/> I installed a <strong><a href="http://jsfiddle.net/GPMta/" rel="nofollow noreferrer">jsfiddle here</a></strong> so you can see it working. The Bounce Out animation is only triggered after the animation finished, nothing unusual about that.</p> <p><br/></p> <h2>The Hard Way</h2> <p>You can pause the animation and parse the current values of the transformation, then install a temporary keyframe animation to bounce out. This gets much more verbose though:</p> <p>First, you have to stop the animations:</p> <pre><code>events.style.webkitAnimationPlayState = "paused"; sports.style.webkitAnimationPlayState = "paused"; </code></pre> <p>Then, you set up a helper to insert new css rules:</p> <pre><code>var addCssRule = function(rule) { var style = document.createElement('style'); style.innerHTML = rule; document.head.appendChild(style); } </code></pre> <p>Then create the css keyframe rules on the fly and insert them:</p> <pre><code> // get the current transform scale of sports and events function getCurrentScaleValue(elem) { return document.defaultView. getComputedStyle(elem, null). getPropertyValue('-webkit-transform'). match(/matrix\(([\d.]+)/)[1]; } var currentSportsScale = getCurrentScaleValue(sports); var currentEventsScale = getCurrentScaleValue(events); // set up the first string for the keyframes rule var sportsTempAnimation = ['@-webkit-keyframes Sports-Temp-Bounce-Out {']; var eventsTempAnimation = ['@-webkit-keyframes Events-Temp-Bounce-Out {']; // basic bounce out animation var bounceOutAnimationBase = { '0%': 1, '40%': 0.1, '60%': 0.4, '80%': 0.1, '90%': 0.2, '100%': 0 }; // scale the animation to the current values for (prop in bounceOutAnimationBase) { sportsTempAnimation.push([ prop, ' { -webkit-transform: scale(', currentSportsScale * bounceOutAnimationBase[prop], ') } '].join('')); eventsTempAnimation.push([ prop, ' { -webkit-transform: scale(', currentEventsScale * bounceOutAnimationBase[prop], ') } ' ].join('')); } // add closing brackets sportsTempAnimation.push('}'); eventsTempAnimation.push('}'); // add the animations to the rules addCssRule([sportsTempAnimation.join(''), eventsTempAnimation.join('')].join(' ')); </code></pre> <p>Then, you restart the animations with these rules:</p> <pre><code> events.style.webkitAnimationName = "Events-Temp-Bounce-Out"; events.style.webkitAnimationDelay = "0s"; sports.style.webkitAnimationDelay = "0s"; sports.style.webkitAnimationName = "Sports-Temp-Bounce-Out"; events.style.webkitAnimationPlayState = "running"; sports.style.webkitAnimationPlayState = "running"; </code></pre> <p><br/> Et voilà. I made a <strong><a href="http://jsfiddle.net/stJFd/" rel="nofollow noreferrer">jsfiddle</a></strong> here so you can play around with it.</p> <p><br/></p> <h2>More Sugar</h2> <ul> <li><p><strong>In your example, the circles bounce out alternating in bounce</strong>. You can easily get this back to work with the second solution by using setTimeout for all sports circle animations. I did not want to include it here because it would unnecessarily complicate the example code.</p></li> <li><p><strong>I know the provided examples are not really DRY</strong>, you could for example make all the stuff for events and sports work with half the lines of code (with meta properties), but in terms of readability, I think this example serves well.</p></li> <li><p><strong>To have this example working in all browsers with support for css3 animations</strong>, you need to normalize the transition properties. To do this in javascript, <a href="https://stackoverflow.com/questions/5023514/how-do-i-normalize-css3-transition-functions-across-browsers">have a look here</a> The Example works for animations and other properties as well, just replace 'transition' with the property you want</p></li> <li><p><strong>For a further read on modifying css3 animations on the fly</strong>, I found <a href="http://blog.joelambert.co.uk/2011/09/07/accessing-modifying-css3-animations-with-javascript/" rel="nofollow noreferrer">this post</a> very useful, have a look at it as well.</p></li> </ul>
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    1. CO+1 very good explanation.
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