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chromium/third_party/blink/web_tests/external/wpt/selection/caret/after-designMode-off.html 

<!doctype html>
<html class="reftest-wait">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<link rel="match" href="after-designMode-off-ref.html">
<style>
:read-only { color: green; }
:read-write { color: red; }
</style>
<script>
addEventListener("load", () => {
  requestAnimationFrame(()=> {
    document.designMode='on';
    getSelection().collapse(document.body.firstChild, 0);
    requestAnimationFrame(()=> {
        document.designMode='off';
        document.documentElement.removeAttribute("class");
    });
  });
}, {once: true});
</script>
</head>
<body>&lt;-- No caret should appear here.</body>
</html>