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<style>
    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;
    }
</style>
<p id="instructions">
    When you click the Change button, the shape will
    <span id="description"></span>.
    <button style="display: block;" onclick="transition()">Change</button>
</p>
<div id="target"></div>
<script>
    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;
        state++;
        if (state < transitions.length)
            document.getElementById("description").innerText = transitions[state].description;
        else {
            document.getElementById("instructions").innerText = "Done.";
        }
    }
</script>
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