Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-dialog-appearance.html 

<!DOCTYPE html>
<meta charset="utf-8" />
<title>Dialog-Popover appearance</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">
<link rel="match" href="popover-dialog-appearance-ref.html">

<p>Both dialogs should have the same shades of background.</p>
<p>The popover should have a completely-transparent ::backdrop.</p>
<dialog popover id=d1>This is a modal dialog</dialog>
<dialog popover id=d2>This is a dialog popover</dialog>

<style>
  dialog {
    left: 50px;
    right: auto;
    bottom: auto;
  }
  #d1 {top:100px;}
  #d2 {top:150px;}
</style>

<script>
  document.getElementById('d1').showModal();
  document.getElementById('d2').showPopover();
</script>