36 lines
1.1 KiB
HTML
36 lines
1.1 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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#scrollContainer {
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width: 100px;
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height: 100px;
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/* Should be bigger than any reasonable scrollbar */
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padding: 30px;
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border: 10px solid blue;
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overflow: scroll;
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background: #818182;
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}
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</style>
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<div id="scrollContainer"></div>
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<script>
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promise_test(async function() {
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let count = 0;
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const scrollContainer = document.getElementById('scrollContainer');
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// 20 to account for the border.
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const scrollbarSize = scrollContainer.offsetWidth - scrollContainer.clientWidth - 20;
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let size = await new Promise(resolve => {
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const observer = new ResizeObserver(entries => {
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resolve(entries[0].contentBoxSize[0]);
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});
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observer.observe(scrollContainer);
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});
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assert_equals(size.inlineSize, 100 - scrollbarSize);
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assert_equals(size.blockSize, 100 - scrollbarSize);
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});
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</script>
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