inserthorizontalrule-in-fieldset-and-everything-styled-white-space-pre.html

<!DOCTYPE html>
<html>
<head>
    <style>
        * {
            white-space: pre
        }
    </style>
    <script>
      document.addEventListener('DOMContentLoaded', () => {
        const quote_0 = document.getElementById('id_0')
        const quote_1 = document.createElement('blockquote')
        const fieldset_1 = document.createElement('fieldset')
        quote_1.appendChild(fieldset_1)
        document.documentElement.appendChild(quote_1)
        const selection = self.getSelection()
        selection.collapse(fieldset_1, 0)
        quote_0.contentEditable = false
        document.documentElement.contentEditable = true
        document.execCommand('insertHorizontalRule', false, null)
      })
    </script>
</head>
<blockquote id='id_0'></blockquote>
</html>

chromium/third_party/blink/web_tests/external/wpt/editing/crashtests/inserthorizontalrule-in-fieldset-and-everything-styled-white-space-pre.html