PerformanceTests/ShadowDOM/ChangingSelect.html

<!DOCTYPE html>
<html>
<head>
    <script type="text/javascript" src="../resources/runner.js"></script>
</head>
<body>

<div id="wrapper">
    <div id="host"></div>
</div>

<script>
var numDivsInHost = 100;
var typeNames = ['A', 'B', 'C'];
var array = new Array(numDivsInHost);

function setup()
{
    var nDivs = numDivsInHost;

    window.shadowRoot = host.webkitCreateShadowRoot();
    shadowRoot.innerHTML = '<h2>Selected</h2><div id="selected"><content select=".selected"></content></div><h2>NonSelected</h2><div id="nonselected"><content></content></div>';

    for (var i = 0; i < nDivs; ++i) {
        var div = document.createElement('div');
        div.appendChild(document.createTextNode('div' + i));
        div.className = typeNames[i % typeNames.length];
        host.appendChild(div);
        array[i] = div;
    }
}

function run()
{
    var nDivs = numDivsInHost;
    var array = window.array;

    var selected = shadowRoot.getElementById('selected');
    var nonSelected = shadowRoot.getElementById('nonselected');
    var contentSelected = selected.querySelector('content');

    for (var i = 0; i < 100; ++i) {
        for (var j = 0; j < typeNames.length; ++j) {
            contentSelected.select = '.' + typeNames[j];

            selected.offsetLeft;
            nonSelected.offsetLeft;
        }
    }
}

function done()
{
    wrapper.innerHTML = '';
}


setup();

PerfTestRunner.measureTime({
    description: "Measure distribution and layout performance when select attribute is changed",
    run: run,
    done: done
});
</script>
</body>
</html>