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Test Info:

<!doctype html>
<html class="reftest-wait">
<meta charset="utf8">
<title>CSS Content Visibility: dialog doesn't show when hidden after render</title>
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<link rel="match" href="container-ref.html">
<meta name="assert" content="top layer dialogs don't render when in skipped subtrees">
<script src="/common/reftest-wait.js"></script>
<style>
.box { width: 150px; height: 150px; background: lightblue }
.hidden { content-visibility: hidden }
</style>
<div id=container class=box>
Fail
<dialog id=dialog>Fail<div id=inner></div></dialog>
</div>
<script>
function runTest() {
container.classList.add("hidden");
dialog.showModal();
takeScreenshot();
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>