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<!doctype html>
<meta charset=utf-8>
<title>Resizer should not set the width/height properties when size doesn't change</title>
<link rel=author href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel=author href="https://mozilla.org" title="Mozilla">
<link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1795536">
<style>
body {
margin: 0;
}
#resizeme {
position: absolute;
top: 100px;
left: 100px;
width: 100px;
height: 100px;
overflow: hidden;
resize: both;
background-color: green;
}
#parent {
background-color: purple;
position: relative;
}
</style>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<div id="parent" style="width: 400px; height: 400px">
<div id="resizeme" style="width: 100px; height: 100px;"></div>
</div>
<script>
function tick() {
return new Promise(r => {
requestAnimationFrame(() => requestAnimationFrame(r));
});
}
promise_test(async function test() {
const element = document.getElementById("resizeme");
{
// Set up the observer.
const observer = new ResizeObserver(entries => {
const rect = entries[0].contentRect;
if (rect.width && rect.height) {
const style = element.style;
const { height, width } = style;
const widthPercent = width.endsWith("%");
const heightPercent = height.endsWith("%");
if (widthPercent && heightPercent) {
return;
}
const parent = element.parentElement;
const parentWidth = parseFloat(parent.style.width);
const parentHeight = parseFloat(parent.style.height);
if (!widthPercent) {
style.width = `${(100 * parseFloat(width)) / parentWidth}%`;
}
if (!heightPercent) {
style.height = `${(100 * parseFloat(height)) / parentHeight}%`;
}
}
});
observer.observe(element);
}
{
// Resize to the smallest horizontal dimension possible.
const rect = element.getBoundingClientRect();
await new test_driver.Actions()
.pointerMove(rect.right - 1, rect.bottom - 1)
.pointerDown()
.pointerMove(rect.left, rect.bottom - 1)
.pointerUp()
.send();
}
await tick();
assert_true(element.style.width.endsWith("%"), "Width is in percent");
assert_true(element.style.height.endsWith("%"), "Height is in percent");
const oldRect = element.getBoundingClientRect();
{
// Try to shrink again (we shouldn't be able to).
await new test_driver.Actions()
.pointerMove(oldRect.right - 1, oldRect.bottom - 1)
.pointerDown()
.pointerMove(oldRect.left, oldRect.bottom - 1)
.pointerUp()
.send();
}
assert_true(element.style.width.endsWith("%"), "Width is still in percent");
assert_true(element.style.height.endsWith("%"), "Height is still in percent");
await tick();
assert_true(element.style.width.endsWith("%"), "Width is still in percent");
assert_true(element.style.height.endsWith("%"), "Height is still in percent");
});
</script>
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