mozilla-central/testing/web-platform/tests/resize-observer/eventloop.html

Source code

Revision control

Copy as Markdown

Other Tools

Test Info: Warnings

<!doctype html>
<title>ResizeObserver notification event loop tests</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/resizeTestHelper.js"></script>
<div id="log"></div>
<script>
'use strict';
// allow uncaught exception because ResizeObserver posts exceptions
// to window error handler when limit is exceeded.
// This codepath is tested in this file.
setup({allow_uncaught_exception: true});
function template() {
let helper = new ResizeTestHelper(
"test0: title",
[
{
setup: observer => {
},
notify: (entries, observer) => {
return true; // Delay next step
}
}
]);
return helper.start();
}
var onErrorCalled = false;
window.onerror = err => {
onErrorCalled = true;
}
function test0() {
let t1 = createAndAppendElement("div");
let t2 = createAndAppendElement("div", t1);
let t3 = createAndAppendElement("div", t2);
let divs = [t1, t2, t3];
let rAF = 0;
let helper = new ResizeTestHelper(
"test0: multiple notifications inside same event loop",
[
{
setup: observer => {
onErrorCalled = false;
observer.observe(t1);
observer.observe(t2);
observer.observe(t3);
},
notify: (entries, observer) => {
assert_equals(entries.length, 3, "3 notifications");
}
},
{
setup: observer => {
helper.startCountingRaf();
divs.forEach( el => { el.style.width = "101px";});
},
notify: (entries, observer) => {
// t1 is not delivered
assert_equals(entries.length, 2, "2 notifications");
assert_equals(helper.rafCount, 0, "still in same loop");
}
},
{
setup: observer => {
divs.forEach( el => { el.style.width = "102px";});
},
notify: (entries, observer) => {
assert_equals(entries.length, 1, "1 notifications");
assert_equals(helper.rafCount, 0, "same loop");
}
},
{ // t1 and t2 get notified
setup: observer => {
},
notify: (entries, observer) => {
assert_equals(entries.length, 2, "2 notifications");
assert_equals(helper.rafCount, 1, "new loop");
assert_equals(onErrorCalled, true, "error was fired");
observer.disconnect();
}
}
]);
return new Promise((resolve, reject) => {
// This test uses requestAnimationFrame() to check the count of event loop,
// but on some browsers, the FrameRequestCallback may be throttled (i.e.
// simply fired after some extra time) in cases where this test is running
// in an iframe that hasn't yet been painted (i.e. we're not visible).
// This may result in some intermittent failures if this test didn't get a
// first paint (and hence may not have started firing FrameRequestCallbacks)
// by the time the test starts expecting helper.rafCount to have changed.
//
// Therefore, we don't start the test logic until body.onload has fired.
// This increases the likelihood that this testcase will have gotten a
// chance to paint when we start invoking requestAnimationFrame, and that
// its rAF callbacks will fire when the test logic expects them to.
document.body.onload = () => resolve();
}).then(() => {
return helper.start(() => t1.remove());
});
}
function test1() {
let t1 = createAndAppendElement("div");
t1.style.width = '100px';
let t2 = createAndAppendElement("div", t1);
let t3 = createAndAppendElement("div", t2);
let shadow = t3.attachShadow({ mode: "open" });
let t4 = createAndAppendElement("div", shadow);
let t5 = createAndAppendElement("div", t4);
let resizers = [t1, t2, t3, t4, t5];
// Testing depths of shadow roots
// DOM: t1 <- t2 <- t3 <-shadow- t4 <- t5
let helper = new ResizeTestHelper(
"test1: depths of shadow roots",
[
{
setup: observer => {
onErrorCalled = false;
resizers.forEach( el => observer.observe(el) );
},
notify: (entries, observer) => {
assert_equals(entries.length, 5, "all entries resized");
}
},
{
setup: observer => {
resizers.forEach( el => el.style.width = "111px" );
},
notify: (entries, observer) => {
assert_equals(entries.length, 4, "depth limited");
}
},
{
setup: observer => {
resizers.forEach( el => el.style.width = "112px" );
},
notify: (entries, observer) => {
assert_equals(entries.length, 3, "depth limited");
}
},
{
setup: observer => {
resizers.forEach( el => el.style.width = "113px" );
},
notify: (entries, observer) => {
assert_equals(entries.length, 2, "depth limited");
}
},
{
setup: observer => {
resizers.forEach( el => el.style.width = "114px" );
},
notify: (entries, observer) => {
assert_equals(entries.length, 1, "depth limited");
}
},
{
setup: observer => {
},
notify: (entries, observer) => {
assert_equals(entries.length, 4, "limit notifications");
assert_equals(onErrorCalled, true, "breached limit");
observer.disconnect();
}
},
]);
return helper.start(() => t1.remove());
}
function test2() {
// <div id="container">
// <div id="a1" style="width:100px;height:100px">
// <div id="a2" style="width:100px;height:100px"></div>
// </div>
// <div id="b1" style="width:100px;height:100px">
// <div id="b2" style="width:100px;height:100px"></div>
// </div>
// </div>
let container = createAndAppendElement("div");
let a1 = createAndAppendElement("div", container);
let a2 = createAndAppendElement("div", a1);
let b1 = createAndAppendElement("div", container);
let b2 = createAndAppendElement("div", b1);
let targets = [a1, a2, b1, b2];
let helper = new ResizeTestHelper(
"test2: move target in dom while inside event loop",
[
{
setup: observer => {
for (let t of targets)
observer.observe(t);
},
notify: (entries, observer) => {
return true; // delay next observation
}
},
{ // resize them all
setup: observer => {
for (let t of targets)
t.style.width = "110px";
},
notify: (entries, observer) => {
assert_equals(entries.length, targets.length, "all targets observed");
}
},
{ // resize all, move dom upwards
setup: observer => {
for (let t of targets)
t.style.width = "130px";
container.appendChild(b2);
},
notify: (entries, observer) => {
assert_equals(entries.length, 1, "b2 moved upwards");
assert_equals(entries[0].target, a2);
}
},
{ // resize all, move dom downwards
setup: observer => {
for (let t of targets)
t.style.width = "130px";
a2.appendChild(b2);
},
notify: (entries, observer) => {
assert_equals(entries.length, 1, "b2 moved downwards");
assert_equals(entries[0].target, b2);
}
},
]);
return helper.start(() => container.remove());
}
let guard;
test(_ => {
assert_own_property(window, "ResizeObserver");
guard = async_test('guard');
}, "ResizeObserver implemented")
test0()
.then(() => test1())
.then(() => test2())
.then(() => guard.done());
</script>