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chromium/third_party/blink/web_tests/wpt_internal/html/semantics/popovers/popover-manual-crash.html 

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8" />
<title>Popover=manual crash test</title>
<link rel="author" href="mailto:[email protected]">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/html/semantics/popovers/resources/popover-utils.js"></script>

<style>
[popover] {top: 100px; bottom: auto;}
[popover=""] {left: -200px}
[popover=auto] {left: 0; }
[popover=manual] {left: 200px; }
</style>

<p>This test passes if it does not crash.</p>
<div popover>Auto1
  <div popover=auto>Auto2</div>
</div>
<div popover=manual>Manual</div>
<script>
  document.querySelectorAll('[popover]').forEach(p => p.showPopover());
  const manual = document.querySelector('[popover=manual]');
  clickOn(manual)
    .then(() => {
      document.documentElement.classList.remove("reftest-wait");
    });
</script>