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<!DOCTYPE html>
<title>ResizeObserver content-box size and scrollbars</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1733042">
<style>
#outer {
position: relative;
width: 100px;
height: 200px;
overflow: auto;
background: #818182;
}
#inner {
position: absolute;
top: 0;
left: 0;
width: 10px;
height: 10px;
background: #0a6fc0;
}
</style>
<div id="outer">
<div id="inner"></div>
</div>
<script>
async function animationFrame() {
return new Promise(r => requestAnimationFrame(r));
}
// This test is expected to fail with overlay scrollbars.
promise_test(async function() {
let count = 0;
const outer = document.getElementById('outer');
const inner = document.getElementById('inner');
const observer = new ResizeObserver(entries => {
count++;
});
observer.observe(outer);
inner.style.top = '1000px';
await animationFrame();
await animationFrame();
inner.style.top = 0;
await animationFrame();
await animationFrame();
assert_equals(count, 2, "ResizeObserver should subtract scrollbar sizes from content-box rect");
});
</script>
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