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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /resize-observer/notify.html - WPT Dashboard Interop Dashboard
<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/resizeTestHelper.js"></script>
<style>
div {
border: 1px dotted gray
}
.transform {
transform: scale(2,2) rotate(90deg)
}
</style>
<p>ResizeObserver tests</p>
<div id="target1" style="width:100px;height:100px;">t1
<div id="target2" style="width:100px;height:100px;">t2
<div id="target3" style="width:100px;height:100px;">t3
<span id="inline">inline</span>
</div>
</div>
</div>
<div id="absolute" style="width:100.5px;height:100.5px;position:absolute;top:10.3px;left:10.3px"></div>
<script>
'use strict';
let t1 = document.querySelector('#target1');
let t2 = document.querySelector('#target2');
let t3 = document.querySelector('#target3');
let abs = document.querySelector('#absolute');
let inline = document.querySelector('#inline');
function test0() {
let helper = new ResizeTestHelper(
"test0: notification ordering",
[
{
setup: observer => {
observer.observe(t3);
observer.observe(t2);
observer.observe(t1);
t1.style.width = "5px";
t3.style.width = "5px";
t2.style.width = "5px";
},
notify: (entries, observer) => {
assert_equals(entries.length, 3, "3 resizes");
assert_equals(entries[0].target, t3, "ordering");
assert_equals(entries[1].target, t2, "ordering");
assert_equals(entries[2].target, t1, "ordering");
observer.disconnect();
t1.style.width = "100px";
t2.style.width = "100px";
t3.style.width = "100px";
}
}
]);
return helper.start();
}
function test1() {
let helper = new ResizeTestHelper(
"test1: display:none triggers notification",
[
{
setup: observer => {
observer.observe(t1);
},
notify: (entries, observer) => {
return true; // Delay next step
}
},
{
setup: observer => {
t1.style.display = "none";
},
notify: (entries, observer) => {
t1.style.display = "";
}
}
]);
return helper.start();
}
function test2() {
let helper = new ResizeTestHelper(
"test2: remove/appendChild trigger notification",
[
{
setup: observer => {
observer.observe(t1);
},
notify: (entries, observer) => {
return true; // Delay next step
}
},
{ // "removeChild triggers notification"
setup: observer => {
t1.parentNode.removeChild(t1);
},
notify: (entries, observer) => {
assert_equals(entries[0].target, t1);
return true; // Delay next step
}
},
{ // "appendChild triggers notification",
setup: observer => {
document.body.appendChild(t1);
},
notify: (entries, observer) => {
assert_equals(entries[0].target, t1)
}
}
]);
return helper.start();
}
function test3() {
let helper = new ResizeTestHelper(
"test3: dimensions match",
[
{
setup: observer => {
observer.observe(t1);
t1.style.width = "200.5px";
t1.style.height = "100px";
t1.style.paddingLeft = "20px";
t1.style.paddingTop = "10px";
},
notify: (entries, observer) => {
assert_equals(entries[0].contentRect.left,20);
assert_equals(entries[0].contentRect.top,10);
assert_between_inclusive(entries[0].contentRect.width, 200.4, 200.6, "width is not rounded");
assert_equals(entries[0].contentRect.height, 100);
}
}
]);
return helper.start();
}
function test4() {
let helper = new ResizeTestHelper(
"test4: transform do not cause notifications",
[
{
setup: observer => {
observer.observe(t2);
},
notify: (entries, observer) => {
return true; // Delay next step
}
},
{
setup: observer => {
t2.classList.add("transform");
},
notify: (entries, observer) => {
assert_unreached("transform must not trigger notifications");
},
timeout: () => {
t2.classList.remove("transform");
}
}
]);
return helper.start();
}
function test5() {
let helper = new ResizeTestHelper(
"test5: moving an element does not trigger notifications",
[
{
setup: observer => {
observer.observe(abs);
},
notify: (entries, observer) => {
return true; // Delay next step
}
},
{
setup: observer => {
abs.style.top = "20.33px";
abs.style.left = "20.33px";
},
notify: (entries, observer) => {
assert_unreached("movement should not cause resize notifications");
},
timeout: () => {
}
}
]);
return helper.start();
}
function test6() {
let helper = new ResizeTestHelper(
"test6: inline element notifies once with 0x0.",
[
{
setup: observer => {
observer.observe(inline);
},
notify: (entries, observer) => {
assert_equals(entries.length, 1, "observing inline element triggers notification");
assert_equals(entries[0].target, inline, "observing inline element triggers notification");
assert_equals(entries[0].contentRect.width, 0);
assert_equals(entries[0].contentRect.height, 0);
return true; // Delay next step
}
},
{
setup: observer => {
inline.style.width = "66px";
},
notify: (entries, observer) => {
assert_unreached("resizing inline element should not cause resize notifications");
},
timeout: () => {
// expected
}
},
{ // "inline element that becomes block should notify",
setup: observer => {
inline.style.display = "block";
},
notify: (entries, observer) => {
assert_equals(entries.length, 1, "inline element becoming a non-zero sized block triggers a notification");
assert_equals(entries[0].target, inline, "inline element becoming a non-zero sized block triggers a notification");
}
}
]);
return helper.start();
}
function test7() {
let helper = new ResizeTestHelper(
"test7: unobserve inside notify callback",
[
{
setup: observer => {
observer.observe(t1);
observer.observe(t2);
},
notify: (entries, observer) => {
t1.style.width = "777px";
t2.style.width = "777px";
observer.unobserve(t1);
return true; // Delay next step
}
},
{
setup: observer => {
},
notify: (entries, observer) => {
assert_equals(entries.length, 1, "only t2 is observed");
assert_equals(entries[0].target, t2, "only t2 is observed");
}
}
]);
return helper.start();
}
function test8() {
let helper = new ResizeTestHelper(
"test8: observe inside notify callback",
[
{
setup: observer => {
observer.observe(t1);
},
notify: (entries, observer) => {
observer.observe(t2);
t2.style.width = "888px";
return true; // Delay next step
}
},
{
setup: observer => {
},
notify: (entries, observer) => {
assert_equals(entries.length, 1, "only t2 is observed");
assert_equals(entries[0].target, t2, "only t2 is observed");
}
}
]);
return helper.start();
}
function test9() {
let helper = new ResizeTestHelper(
"test9: disconnect inside notify callback",
[
{
setup: observer => {
observer.observe(t1);
},
notify: (entries, observer) => {
t1.style.width = "999px";
observer.disconnect();
return true; // Delay next step
}
},
{
setup: observer => {
},
notify: (entries, observer) => {
assert_unreached("there should be no notifications after disconnect");
},
timeout: () => {
}
}
]);
return helper.start();
}
function test10() {
var parent = t1.parentNode;
let helper = new ResizeTestHelper(
"test10: element notifies when parent removed",
[
{
setup: observer => {
observer.observe(t3);
},
notify: (entries, observer) => {
return true; // Delay next step
}
},
{
setup: observer => {
t1.parentNode.removeChild(t1);
},
notify: (entries, observer) => {
assert_equals(entries.length, 1);
assert_equals(entries[0].target, t3);
parent.appendChild(t1);
}
}
]);
return helper.start();
}
function test11() {
let t = createAndAppendElement("div");
t.style.display = "none";
let helper = new ResizeTestHelper(
"test11: display:none element should be notified",
[
{
setup: observer => {
observer.observe(t);
},
notify: entries => {
assert_equals(entries.length, 1, "1 pending notification");
assert_equals(entries[0].target, t, "target is t");
assert_equals(entries[0].contentRect.width, 0, "target width");
assert_equals(entries[0].contentRect.height, 0, "target height");
}
}
]);
return helper.start(() => t.remove());
}
function test12() {
let t = createAndAppendElement("div");
t.style.width = "0px";
let helper = new ResizeTestHelper(
"test12: element sized 0x0 should be notified",
[
{
setup: observer => {
observer.observe(t);
},
notify: entries => {
assert_equals(entries.length, 1, "1 pending notification");
assert_equals(entries[0].target, t, "target is t");
assert_equals(entries[0].contentRect.width, 0, "target width");
assert_equals(entries[0].contentRect.height, 0, "target height");
}
}
]);
return helper.start(() => t.remove());
}
let guard;
test(_ => {
assert_own_property(window, "ResizeObserver");
guard = async_test('guard');
}, "ResizeObserver implemented")
test0()
.then(() => { return test1(); })
.then(() => { return test2(); })
.then(() => { return test3(); })
.then(() => { return test4(); })
.then(() => { return test5(); })
.then(() => { return test6(); })
.then(() => { return test7(); })
.then(() => { return test8(); })
.then(() => { return test9(); })
.then(() => { return test10(); })
.then(() => { return test11(); })
.then(() => { return test12(); })
.then(() => { guard.done(); });
</script>