<!doctype html>
<title>ResizeObserver tests</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/resizeTestHelper.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';
function test0() {
let t = createAndAppendElement("div");
t.style.width = "100px";
let helper = new ResizeTestHelper(
"test0: simple observation",
[
{
setup: observer => {
observer.observe(t);
t.style.width = "5px";
},
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, 5, "target width");
}
}
]);
return helper.start(() => t.remove());
}
function test1() {
let t = createAndAppendElement("div");
t.style.width = "100px";
let helper = new ResizeTestHelper(
"test1: multiple observation on same element trigger only one",
[
{
setup: observer => {
observer.observe(t);
observer.observe(t);
t.style.width = "10px";
},
notify: entries => {
assert_equals(entries.length, 1, "1 pending notification");
}
}
]);
return helper.start(() => t.remove());
}
function test2() {
test(() => {
assert_throws_js(TypeError, _=> {
let ro = new ResizeObserver(() => {});
ro.observe({});
});
},
"test2: throw exception when observing non-element"
);
return Promise.resolve();
}
function test3() {
let t1 = createAndAppendElement("div");
let t2 = createAndAppendElement("div");
t1.style.width = "100px";
t2.style.width = "100px";
let helper = new ResizeTestHelper(
"test3: disconnect stops all notifications", [
{
setup: observer => {
observer.observe(t1);
observer.observe(t2);
observer.disconnect();
t1.style.width = "30px";
},
notify: entries => {
assert_unreached("no entries should be observed");
},
timeout: () => {
// expected
}
}
]);
return helper.start(() => {
t1.remove();
t2.remove();
});
}
function test4() {
let t1 = createAndAppendElement("div");
let t2 = createAndAppendElement("div");
t1.style.width = "100px";
t2.style.width = "100px";
let helper = new ResizeTestHelper(
"test4: unobserve target stops notifications, unobserve non-observed does nothing", [
{
setup: observer => {
observer.observe(t1);
observer.observe(t2);
observer.unobserve(t1);
observer.unobserve(document.body);
t1.style.width = "40px";
t2.style.width = "40px";
},
notify: entries => {
assert_equals(entries.length, 1, "only t2");
assert_equals(entries[0].target, t2, "t2 was observed");
}
}
]);
return helper.start(() => {
t1.remove();
t2.remove();
});
}
function test5() {
const img = new Image();
img.style.width = "15px";
img.style.height = "15px";
img.src = "resources/image.png";
return img.decode().then(() => {
return new Promise(resolve => {
requestAnimationFrame(() => {
document.body.appendChild(img);
resolve();
});
});
}).then(() => {
let helper = new ResizeTestHelper("test5: observe img",[
{
setup: observer => {
observer.observe(img);
},
notify: entries => {
return true;
}
},
{
setup: observer => {
img.style.width = "15.5px";
},
notify: entries => {
assert_equals(entries.length, 1);
assert_equals(entries[0].contentRect.width, 15.5);
}
}
]);
return helper.start(() => img.remove());
}, () => {
// dummy test for dumping the error message.
test(_ => {
assert_unreached("decode image failed");
}, "test5: observe img");
});
}
function test6() {
let iframe = createAndAppendElement("iframe");
iframe.width = "300px";
iframe.height = "100px";
iframe.style.display = "block";
let resolvePromise;
let promise = new Promise((resolve) => {
resolvePromise = resolve;
});
let test = async_test('test6: iframe notifications');
let testRequested = false;
test.add_cleanup(() => iframe.remove());
window.addEventListener('message', event => {
switch(event.data) {
case 'readyToTest':
if (!testRequested) {
iframe.contentWindow.postMessage('startTest', '*');
testRequested = true;
}
break;
case 'success':
case 'fail':
window.requestAnimationFrame(() => {
resolvePromise();
test.step(() => {
assert_equals(event.data, 'success');
test.done();
});
});
break;
}
}, false);
iframe.src = "./resources/iframe.html";
return new Promise(function(resolve, reject) {
iframe.onload = () => resolve();
iframe.onerror = () => reject();
}).then(() => {
return promise;
}).catch(error => {
test.step(() => {
assert_unreached("loading iframe is error");
});
});
}
function test7() {
let harnessTest = async_test("test7: callback.this");
let resolvePromise;
let ro = new ResizeObserver( function(entries, obs) {
let callbackThis = this;
harnessTest.step(() => {
assert_equals(callbackThis, ro, "callback.this is ResizeObserver");
assert_equals(obs, ro, "2nd argument is ResizeObserver");
ro.disconnect();
// every reference to RO must be null before test completes
// to avoid triggering test leak-detection
ro = null;
callbackThis = null;
obs = null;
harnessTest.step_timeout( _ => {
harnessTest.done();
resolvePromise();
}, 0);
});
}
);
let t = createAndAppendElement("div");
t.style.width = "100px";
harnessTest.add_cleanup(() => t.remove());
ro.observe(t);
return new Promise( (resolve, reject) => {
resolvePromise = resolve;
});
}
function test8() {
let t = createAndAppendElement("div");
t.style.width = "100px";
t.style.height = "100px";
let helper = new ResizeTestHelper(
"test8: simple content-box observation",
[
{
setup: observer => {
observer.observe(t, { box: "content-box" });
},
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, 100, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentRect.top, 0, "target top padding");
assert_equals(entries[0].contentRect.left, 0, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 100,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 100,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 100,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 100,
"target border-box block size");
return true;
}
},
{
setup: observer => {
t.style.width = "90px";
t.style.height = "90px";
},
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, 90, "target width");
assert_equals(entries[0].contentRect.height, 90, "target height");
assert_equals(entries[0].contentRect.top, 0, "target top padding");
assert_equals(entries[0].contentRect.left, 0, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 90,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 90,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 90,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 90,
"target border-box block size");
return true;
}
},
{
setup: observer => {
t.style.padding = "5px";
},
notify: entries => {
assert_unreached("the 'content-box' ResizeObserver shouldn't fire " +
"for restyles that don't affect the content-box size");
},
timeout: () => {
// expected
// Note: the border-box size is 100px x 100px right now.
}
}
]);
return helper.start(() => t.remove());
}
function test9() {
let t = createAndAppendElement("div");
t.style.width = "100px";
t.style.height = "100px";
let helper = new ResizeTestHelper(
"test9: simple content-box observation but keep border-box size unchanged",
[
{
setup: observer => {
observer.observe(t, { box: "content-box" });
},
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, 100, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentRect.top, 0, "target top padding");
assert_equals(entries[0].contentRect.left, 0, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 100,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 100,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 100,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 100,
"target border-box block size");
return true;
}
},
{
setup: observer => {
// Keep the border-box size the same, and change the content-box size.
t.style.width = "92px";
t.style.height = "92px";
t.style.padding = "4px";
},
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, 92, "target width");
assert_equals(entries[0].contentRect.height, 92, "target height");
assert_equals(entries[0].contentRect.top, 4, "target top padding");
assert_equals(entries[0].contentRect.left, 4, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 92,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 92,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 100,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 100,
"target border-box block size");
}
}
]);
return helper.start(() => t.remove());
}
function test10() {
let t = createAndAppendElement("div");
t.style.width = "100px";
t.style.height = "100px";
let helper = new ResizeTestHelper(
"test10: simple border-box observation",
[
{
setup: observer => {
observer.observe(t, { box: "border-box" });
},
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, 100, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentRect.top, 0, "target top padding");
assert_equals(entries[0].contentRect.left, 0, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 100,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 100,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 100,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 100,
"target border-box block size");
return true;
}
},
{
setup: observer => {
t.style.padding = "4px";
},
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, 100, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentRect.top, 4, "target top padding");
assert_equals(entries[0].contentRect.left, 4, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 100,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 100,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 108,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 108,
"target border-box block size");
}
},
{
setup: observer => {
t.style.width = "104px";
t.style.height = "104px";
t.style.padding = "2px";
},
notify: entries => {
assert_unreached("the 'border-box' ResizeObserver shouldn't fire " +
"for restyles that don't affect the border-box size");
},
timeout: () => {
// expected: 104 + 2 * 2 = 108. The border-box size is the same.
}
}
]);
return helper.start(() => t.remove());
}
function test11() {
let wrapper = createAndAppendElement("div");
wrapper.style.width = "100px";
wrapper.style.height = "100px";
wrapper.style.writingMode = "vertical-rl";
let t = createAndAppendElement("div", wrapper);
t.style.inlineSize = "50px";
t.style.blockSize = "50px";
let helper = new ResizeTestHelper(
"test11: simple observation with vertical writing mode",
[
{
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, 50, "target width");
assert_equals(entries[0].contentRect.height, 50, "target height");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 50,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 50,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 50,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 50,
"target border-box block size");
return true;
}
},
{
setup: observer => {
t.style.blockSize = "75px";
},
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, 75, "target width");
assert_equals(entries[0].contentRect.height, 50, "target height");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 50,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 75,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 50,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 75,
"target border-box block size");
}
}
]);
return helper.start(() => {
t.remove();
wrapper.remove();
});
}
function test12() {
let t = createAndAppendElement("div");
t.style.writingMode = "vertical-lr";
t.style.inlineSize = "100px";
t.style.blockSize = "50px";
let helper = new ResizeTestHelper(
"test12: no observation is fired after the change of writing mode when " +
"box's specified size comes from logical size properties.",
[
{
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, 50, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 100,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 50,
"target content-box block size");
return true;
}
},
{
setup: observer => {
t.style.writingMode = "horizontal-tb";
},
notify: entries => {
assert_unreached("the logical size of content-box doesn't change");
},
timeout: () => {
// expected: We don't change the logical size of content-box.
}
}
]);
return helper.start(() => t.remove());
}
function test13() {
let t = createAndAppendElement("div");
t.style.writingMode = "vertical-lr";
t.style.height = "100px";
t.style.width = "50px";
let helper = new ResizeTestHelper(
"test13: an observation is fired after the change of writing mode when " +
"box's specified size comes from physical size properties.",
[
{
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, 50, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 100,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 50,
"target content-box block size");
return true;
}
},
{
setup: observer => {
t.style.writingMode = "horizontal-tb";
},
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, 50, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 50,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 100,
"target content-box block size");
},
}
]);
return helper.start(() => t.remove());
}
function test14() {
let t = createAndAppendElement("div");
t.style.width = "100px";
t.style.height = "100px";
let helper = new ResizeTestHelper(
"test14: observe the same target but using a different box should " +
"override the previous one",
[
{
setup: observer => {
observer.observe(t, { box: "content-box" });
observer.observe(t, { box: "border-box" });
},
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, 100, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentRect.top, 0, "target top padding");
assert_equals(entries[0].contentRect.left, 0, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 100,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 100,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 100,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 100,
"target border-box block size");
return true;
}
},
{
setup: observer => {
// Change border-box size.
t.style.padding = "4px";
},
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, 100, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentRect.top, 4, "target top padding");
assert_equals(entries[0].contentRect.left, 4, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 100,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 100,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 108,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 108,
"target border-box block size");
}
},
{
setup: observer => {
// Change only content-box size.
t.style.width = "104px";
t.style.height = "104px";
t.style.padding = "2px";
},
notify: entries => {
assert_unreached("the 'border-box' ResizeObserver shouldn't fire " +
"for restyles that don't affect the border-box size");
},
timeout: () => {
// expected: 104 + 2 * 2 = 108. The border-box size is the same.
}
}
]);
return helper.start(() => t.remove());
}
function test15() {
let t = createAndAppendElement("div");
t.style.height = "100px";
t.style.width = "50px";
let helper = new ResizeTestHelper(
"test15: an observation is fired with box dimensions 0 when element's " +
"display property is set to inline",
[
{
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, 50, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 50,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 100,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 50,
"target content-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 100,
"target content-box block size");
return true;
}
},
{
setup: observer => {
t.style.display = "inline";
},
notify: entries => {
assert_equals(entries[0].contentRect.width, 0, "target width");
assert_equals(entries[0].contentRect.height, 0, "target height");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 0,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 0,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 0,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 0,
"target border-box block size");
}
}
]);
return helper.start(() => t.remove());
}
function test16() {
let t = createAndAppendElement("span");
let helper = new ResizeTestHelper(
// See: https://drafts.csswg.org/resize-observer/#intro.
"test16: observations fire once with 0x0 size for non-replaced inline elements",
[
{
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");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 0,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 0,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 0,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 0,
"target border-box block size");
}
}
]);
return helper.start(() => t.remove());
}
function test17() {
// <div id="outer">
// <div id="nested">
// </div>
// </div>
let outer = document.createElement('div');
outer.style.width = "100px";
outer.style.height = "100px";
outer.style.padding = "10px";
outer.style.border = "1px solid blue"
let nested = document.createElement('div');
nested.style.width = "60px";
nested.style.height = "50px";
nested.style.padding = "5%";
nested.style.boxSizing = "border-box";
nested.style.border = "5px solid black";
outer.appendChild(nested);
document.body.appendChild(outer);
let helper = new ResizeTestHelper(
"test17: Box sizing snd Resize Observer notifications",
[
{
setup: observer => {
observer.observe(nested, { box: "content-box" });
},
notify: entries => {
assert_equals(entries.length, 1, "1 pending notification");
assert_equals(entries[0].target, nested, "target is nested");
assert_equals(entries[0].contentRect.width, 40, "target width");
assert_equals(entries[0].contentRect.height, 30, "target height");
assert_equals(entries[0].contentRect.top, 5, "target top padding");
assert_equals(entries[0].contentRect.left, 5, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 40,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 30,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 60,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 50,
"target border-box block size");
return true;
}
},
{
// Changes to a parent's dimensions with a child's padding set as a percentage
// should fire observation if content-box is being observed
setup: observer => {
outer.style.height = "200px";
outer.style.width = "200px";
},
notify: entries => {
assert_equals(entries.length, 1, "1 pending notification");
assert_equals(entries[0].target, nested, "target is nested");
assert_equals(entries[0].contentRect.width, 30, "target width");
assert_equals(entries[0].contentRect.height, 20, "target height");
assert_equals(entries[0].contentRect.top, 10, "target top padding");
assert_equals(entries[0].contentRect.left, 10, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 30,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 20,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 60,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 50,
"target border-box block size");
return true;
}
},
{
// Changes to a parent's dimensions with a child's padding set as a percentage
// should fire observation if content-box is being observed
setup: observer => {
nested.style.border = "1px solid black";
},
notify: entries => {
assert_equals(entries.length, 1, "1 pending notification");
assert_equals(entries[0].target, nested, "target is nested");
assert_equals(entries[0].contentRect.width, 38, "target width");
assert_equals(entries[0].contentRect.height, 28, "target height");
assert_equals(entries[0].contentRect.top, 10, "target top padding");
assert_equals(entries[0].contentRect.left, 10, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 38,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 28,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 60,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 50,
"target border-box block size");
return true;
}
},
{
setup: observer => {
observer.observe(nested, { box: "border-box" });
},
notify: entries => {
assert_equals(entries.length, 1, "1 pending notification");
assert_equals(entries[0].target, nested, "target is nested");
assert_equals(entries[0].contentRect.width, 38, "target width");
assert_equals(entries[0].contentRect.height, 28, "target height");
assert_equals(entries[0].contentRect.top, 10, "target top padding");
assert_equals(entries[0].contentRect.left, 10, "target left padding");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 38,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 28,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 60,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 50,
"target border-box block size");
return true;
}
},
{
// Changes to a parent's dimensions with a child's padding set as a percentage
// should not fire observation if border-box is being observed
setup: observer => {
outer.style.height = "100px";
},
notify: entries => {
assert_unreached("No observation should be fired when nested border box remains constant");
},
timeout: () => {
// expected
}
},
]);
return helper.start(() => nested.remove());
}
function test18() {
let t = createAndAppendElement("div");
t.style.height = "100px";
t.style.width = "50px";
let helper = new ResizeTestHelper(
"test18: an observation is fired when device-pixel-content-box is being " +
"observed",
[
{
setup: observer => {
observer.observe(t, {box: "device-pixel-content-box"});
},
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, 50, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 50,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 100,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 50,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 100,
"target border-box block size");
assert_equals(entries[0].devicePixelContentBoxSize[0].inlineSize, 50,
"target device-pixel-content-box inline size");
assert_equals(entries[0].devicePixelContentBoxSize[0].blockSize, 100,
"target device-pixel-content-box block size");
}
},
]);
return helper.start(() => t.remove());
}
function test19() {
// zoom is not a standard css property, so we should check it first. If the
// browser doesn't support it, we skip this test.
if (!CSS.supports("zoom", "3")) {
return Promise.resolve();
}
let t = createAndAppendElement("div");
t.style.height = "100px";
t.style.width = "50px";
let helper = new ResizeTestHelper(
"test19: an observation is fired when device-pixel-content-box is being " +
"observed and zoom change",
[
{
setup: observer => {
observer.observe(t, {box: "device-pixel-content-box"});
},
notify: entries => {
// No need to test again (see test18), so skip this event loop.
return true;
}
},
{
setup: observer => {
document.body.style.zoom = 3;
},
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, 50, "target width");
assert_equals(entries[0].contentRect.height, 100, "target height");
assert_equals(entries[0].contentBoxSize[0].inlineSize, 50,
"target content-box inline size");
assert_equals(entries[0].contentBoxSize[0].blockSize, 100,
"target content-box block size");
assert_equals(entries[0].borderBoxSize[0].inlineSize, 50,
"target border-box inline size");
assert_equals(entries[0].borderBoxSize[0].blockSize, 100,
"target border-box block size");
assert_equals(entries[0].devicePixelContentBoxSize[0].inlineSize, 150,
"target device-pixel-content-box inline size");
assert_equals(entries[0].devicePixelContentBoxSize[0].blockSize, 300,
"target device-pixel-content-box block size");
return true;
}
},
{
setup: observer => {
document.body.style.zoom = '';
},
notify: entries => {}
}
]);
return helper.start(() => t.remove());
}
let guard;
test(_ => {
assert_own_property(window, "ResizeObserver");
guard = async_test('guard');
}, "ResizeObserver implemented")
test0()
.then(() => test1())
.then(() => test2())
.then(() => test3())
.then(() => test4())
.then(() => test5())
.then(() => test6())
.then(() => test7())
.then(() => test8())
.then(() => test9())
.then(() => test10())
.then(() => test11())
.then(() => test12())
.then(() => test13())
.then(() => test14())
.then(() => test15())
.then(() => test16())
.then(() => test17())
.then(() => test18())
.then(() => test19())
.then(() => guard.done());
</script>
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