chromium/third_party/blink/web_tests/editing/deleting/type-delete-after-quote.html

<!doctype HTML>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
selection_test(
  [
    '<div contenteditable>',
      '<blockquote type="cite"><br></blockquote>|',
      'ab',
    '</div>',
  ],
  'Delete',
  [
    '<div contenteditable>',
      '<blockquote type="cite">|ab</blockquote>',
    '</div>',
  ],
  '1 Delete to replace empty blockquote placeholder BR with following text');

selection_test(
  [
    '<div contenteditable>',
      '<blockquote type="cite">ab<br><br></blockquote>|',
      'CD',
    '</div>',
  ],
  'Delete',
  [
    '<div contenteditable>',
      '<blockquote type="cite">ab<br>|CD</blockquote>',
    '</div>',
  ],
  '2 Delete to replace blockquote placeholder BR with following text');
</script>