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