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test.html
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/
test.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<link rel="stylesheet" type="text/css" href="shell.css">
<title>event-loop test</title>
</head>
<body style="height: 2000px;">
<button id="testButton" onclick="startTest()" style="font-size:xx-large">Redo test</script>
<div style="overflow:hidden">
<div id="slider"></div>
</div>
<div id="mutator"></div>
<script>
'use strict';
var RESULTS = [];
var TIMED_RESULTS = [];
function addResultToDocument(msg, type) {
var el = document.createElement('div');
if (type)
el.classList.add(type);
el.classList.add('result');
el.innerText = msg;
document.body.appendChild(el);
}
function reportError(msg) {
addResultToDocument(msg, 'error');
}
let startTime = 0;
function log(/*...args*/) {
var line = "";
for (var i=0; i<arguments.length; i++)
line += (i != 0 ? ' ' : '') + arguments[i];
if (startTime == 0)
startTime = performance.now();
var tick = Math.round((performance.now()-startTime)*100)/100;
console.log(tick + ' ' + line);
RESULTS.push(line);
TIMED_RESULTS.push( { event: line, time: tick});
}
function assertOrder(r1, r2, msg) {
var i1 = RESULTS.indexOf(r1);
var i2 = RESULTS.indexOf(r2);
if (i1 == -1)
reportError(r1 + " not found");
if (i2 == -1)
reportError(r2 + " not found");
if (i2 <= i1)
reportError('"' + r1 + '" before "' + r2 + '": ' + msg);
}
function endTest() {
// Promise/rAF asserts
assertOrder("script end", "promise A", "promise handlers executed after script");
assertOrder("promise A", "promise B", "promise handlers in order");
assertOrder("rAF A", "rAF B", "rAF in order");
assertOrder("promise A", "rAF A", "rAF after promise handlers");
assertOrder("promise A", "timeout A", "timeout after promise handlers");
assertOrder("rAF A promise", "rAF B", "promise handler immediately after rAF");
var p1 = RESULTS.indexOf('promise B'), p0 = RESULTS.indexOf('promise A');
if ((p1 - p0) > 2)
reportError("Microtasks queue not executed all at once, distance is " + (p1 - p0) );
assertOrder("promise A", "mutate", "mutate microtask after promise A")
assertOrder("mutate", "promise B", "mutate happens before promise B resolves");
// render events
assertOrder("matchMedia", "resize", "matchMedia before resize");
assertOrder("resize", "scroll", "resize before scroll");
assertOrder("scroll", "rAF A", "scroll before rAF");
assertOrder("animationstart", "rAF A", "css animation starts before rAF");
assertOrder("resize", "animationstart", "css animation starts before rAF");
// addResultToDocument("rAF and timeout order is unspecified", "warn");
if (!document.querySelector('.error'))
addResultToDocument('tests passed');
document.querySelector('#slider').classList.remove('animate');
addResultToDocument('output in console');
}
function startTest() {
RESULTS = [];
log("script start");
var oldResults = document.querySelectorAll('.result');
for (var i=0; i<oldResults.length; i++)
oldResults[i].parentNode.removeChild(oldResults[i]);
// for (var el of document.querySelectorAll('.result'))
// el.parentNode.removeChild(el);
// rAF
window.requestAnimationFrame( function() {
log("rAF A");
if (window.ResizeObserver) {
var ro = new ResizeObserver(function(entries) {
log("ResizeObserver raf");
});
ro.observe(document.querySelector('#mutator'));
}
new Promise( function(fulfill, reject) {
fulfill();
})
.then( function() {
log("rAF A promise");
});
});
window.requestAnimationFrame( function() {
log("rAF B");
});
// timeouts
window.setTimeout(function() { log('timeout A');}, 0);
window.setTimeout(function() { log('timeout B');}, 0);
// Promises
Promise.resolve()
.then(function() {
log("promise A");
return new Promise( function(fulfill) {
fulfill();
});
})
.then(function() {
log("promise B");
});
// CSS Animation
document.querySelector('#slider').classList.remove('animate');
document.querySelector('#slider').classList.add('animate');
// Scrolling
window.scrollBy(0,10);
// Resize
try {
window.parent.document.querySelector('iframe').width = "450px";
}
catch(ex) {
console.error('resize not tested, not an iframe');
}
// ResizeObserver
if (window.ResizeObserver) {
var ro = new ResizeObserver(function(entries) {
log("ResizeObserver script");
});
ro.observe(document.querySelector('#mutator'));
}
// Mutations
document.querySelector('#mutator').appendChild(
document.createElement('div')
);
// Test end
window.setTimeout(function() { endTest(); }, 500);
log("script end");
}
// Listeners
window.addEventListener('resize', function() {
log('resize');
});
window.addEventListener('scroll', function() {
log('scroll');
});
window.matchMedia("(min-width: 400px)").addListener( function() {
log('matchMedia');
});
document.querySelector('#slider').addEventListener('animationstart', function() {
log('animationstart');
});
var mutObs = new MutationObserver( function(entries) {
log('mutate');
});
mutObs.observe(document.querySelector('#mutator'),
{ childList: true, attributes: true });
window.addEventListener('message', function(ev) {
switch(ev.data) {
case 'startTest':
window.requestAnimationFrame(startTest);
break;
default:
break;
}
});
</script>
</body>
</html>