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