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<!doctype html>
<html>
<head>
<meta name="viewport" content="user-scalable:no">
<style type="text/css">
body { height: 1500px; }
#center {
position: fixed;
left: 40%;;
width: 50%;
height: 250px;
top: 25%;
background-color: grey;
-webkit-transform: scale(0.25, 0.25);
-webkit-transition: -webkit-transform 1s;
}
#drawer {
position: fixed;
top: 0;
left: 0;
height: 100%;
width: 120px;
background-color: red;
-webkit-transform: translate3d(-1000px, 0, 0);
-webkit-transition: -webkit-transform 1s;
}
</style>
<script>
'use strict';
window.animationDone = false;
function makeAnimation() {
var centerEl = document.querySelector('#center');
centerEl.style.webkitTransform = 'scale(1.0, 1.0)';
console.time('Interaction.CenterAnimation');
centerEl.addEventListener('transitionend', function() {
console.timeEnd('Interaction.CenterAnimation');
var drawerEl = document.querySelector('#drawer');
drawerEl.style.webkitTransform = 'translate3D(0, 0, 0)';
console.time('Interaction.DrawerAnimation');
drawerEl.addEventListener('transitionend', function() {
console.timeEnd('Interaction.DrawerAnimation');
window.animationDone = true;
});
});
}
</script>
<script>
'use strict';
var jankMs = 100;
var slowMs = 200;
window.jankScriptDone = false;
window.slowScriptDone = false;
function waitMs(ms) {
var startTime = window.performance.now();
var currTime = startTime;
while (currTime - startTime < ms) {
var currTime = window.performance.now();
}
}
function makeJank() {
console.time('Interaction.JankThreadJSRun');
waitMs(jankMs);
console.timeEnd('Interaction.JankThreadJSRun');
window.jankScriptDone = true;
}
function makeSlow() {
console.time('Interaction.SlowThreadJsRun');
waitMs(slowMs);
console.timeEnd('Interaction.SlowThreadJsRun');
window.slowScriptDone = true;
}
</script>
</head>
<body>
<div id="center">
This is something in the middle.
</div>
<div id="drawer">
This is a drawer.
</div>
<button type="button" id="animating-button" onclick="makeAnimation()">
Click or tap this to trigger an animation.
</div>
<button type="button" id="jank-button" onclick="makeJank()">
Click or tap this to make jank of 100ms (approximately).
</div>
<button type="button" id="slow-button" onclick="makeSlow()">
Click or tap this to make wait 200ms (approximately).
</div>
</body>
</html>
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