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<!doctype HTML>
<html>
<meta charset="utf8">
<title>Content Visibility: slot moved after container is hidden</title>
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
<meta name="assert" content="ensure that hidden slotted element can be updated">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body style="margin: 0">
<div id=host>
<input id=slotted style="margin: 0">
<script>
async_test((t) => {
let container = document.createElement("div");
container.innerHTML = "<slot></slot>";
let shadowRoot = host.attachShadow({ mode: "open" });
shadowRoot.innerHTML = "<style>.hidden { content-visibility: hidden }</style>";
shadowRoot.appendChild(container);
t.step(async () => {
container.classList.add("hidden");
requestAnimationFrame(() => {
assert_equals(slotted.offsetTop, 0);
container.innerHTML = "<div style='height: 20px;'></div><slot></slot>";
t.done();
});
});
});
</script>
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