<!
DOCTYPE HTML>
<
html>
<
head>
<
meta charset=
"utf-8">
<
title>Test microtask suppression</
title>
<
script src=
"/tests/SimpleTest/SimpleTest.js"></
script>
<
link rel=
"stylesheet" href=
"/tests/SimpleTest/test.css"/>
<
script>
SimpleTest.waitForExplicitFinish();
var previousTask = -1;
function test() {
let win = window.open(
"about:blank");
win.onload = function() {
win.onmessage = function() {
win.start = win.performance.now();
win.didRunMicrotask = false;
win.onmessage = function() {
ok(win.didRunMicrotask,
"Should have run a microtask.");
let period = win.performance.now() - win.start;
win.opener.ok(
period < 200,
"Running a task should be fast. Took " + period +
"ms.");
win.onmessage = null;
}
win.queueMicrotask(function() { win.didRunMicrotask = true; });
win.postMessage(
"measurementMessage",
"*");
}
win.postMessage(
"initialMessage",
"*");
const last = 500000;
for (let i = 0; i < last + 1; ++i) {
window.queueMicrotask(function() {
// Check that once microtasks are unsuppressed, they are handled in
// the correct order.
if (previousTask != i - 1) {
// Explicitly optimize out cases which pass.
ok(false,
"Microtasks should be handled in order.");
}
previousTask = i;
if (i == last) {
win.close();
SimpleTest.finish();
}
});
}
// Synchronous XMLHttpRequest suppresses microtasks.
var xhr = new XMLHttpRequest();
xhr.open(
"GET",
"slow.sjs", false);
xhr.send();
is(previousTask, -1,
"Shouldn't have run microtasks during a sync XHR.");
}
}
</
script>
</
head>
<
body onload=
"test()">
<p id=
"display"></p>
<
div id=
"content" style=
"display: none"></
div>
<
pre id=
"test"></
pre>
</
body>
</
html>
