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div {
width: 50px;
height: 50px;
background-color: green;
div.square {
width: 100px;
height: 100px;
-webkit-transition-property: height;
-webkit-transition-duration: 2s;
div.rectangle {
width: 100px;
height: 200px;
-webkit-transition-property: width, height;
-webkit-transition-duration: 5s;
<p id="instructions">
When you click the Change button, the shape will
<span id="description"></span>.
<button style="display: block;" onclick="transition()">Change</button>
<div id="target"></div>
var state = 0;
var transitions = [
{className:"rectangle", description:"animate to a large rectangle over 5 seconds."},
{className:"square", description:"animate to a square over 2 seconds. Try clicking before the first animation finishes and make sure the width doesn't do an ugly jump."},
{className:"", description:"instantly change to a small square"},
{className:"square", description:"instantly change into a small rectangle and then animate into a large square over 2 seconds"},
{className:"rectangle", description:"animate to a large rectangle over 5 seconds"},
{className:"", description:"instantly change to a small square"}
document.getElementById("description").innerText = transitions[0].description;
function transition()
var target = document.getElementById("target");
target.className = transitions[state].className;
if (state < transitions.length)
document.getElementById("description").innerText = transitions[state].description;
else {
document.getElementById("instructions").innerText = "Done.";
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