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<!DOCTYPE html>
<title>cssom-view - scroll-behavior: smooth after hiding iframe</title>
<meta name="viewport" content="width=device-width,initial-scale=1">
<link rel="help" href="https://drafts.csswg.org/cssom-view/#smooth-scrolling">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<style>
#scroller {
width: 300px;
height: 300px;
overflow-y: scroll;
}
</style>
<body>
<div id="scroller">
<div id="firstTab">
<iframe srcdoc='<html><style>body { height: 200vh; }</style><body></body></html>'></iframe>
</div>
<div id="secondTab" style="display: none">
<div style="width: 200px; height: 5000px;"></div>
<div style="width: 100px; height: 100px; background: green;"></div>
</div>
</div>
<script>
promise_test(async (t) => {
await waitForCompositorReady();
// Wait for initial layout/paint
await waitForCompositorCommit();
const firstTab = document.getElementById('firstTab');
const secondTab = document.getElementById('secondTab');
const scroller = document.getElementById('scroller');
// Hide first tab
firstTab.style.display = 'none';
await waitForCompositorCommit();
// Show second tab and scroll.
secondTab.style.display = 'block';
const scrollEndPromise = new Promise(resolve => {
scroller.addEventListener('scrollend', resolve, {once: true});
});
// Smooth scroll to the end.
scroller.scroll({top: 999999, left: 0, behavior: "smooth" });
await scrollEndPromise;
const scrolledToBottom = Math.abs(scroller.scrollHeight - scroller.clientHeight - scroller.scrollTop) < 1;
assert_true(scrolledToBottom, "Scroller should be at the bottom after scrollend fires. Current scrollTop: " + scroller.scrollTop);
}, "Smooth scroll finishes correctly after hiding a tab with an iframe");
</script>
</body>
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