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chromium/third_party/blink/web_tests/editing/inserting/break-blockquote-after-delete.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
// This tests that the blockquote's typing style doesn't remain after
// breaking the blockquote and typing in the unquoted area.
selection_test(
    [
      '<div contenteditable>',
        '<blockquote type="cite">blue',
          '<div>^<br></div>',
            '<div>',
              '<blockquote type="cite">|green</blockquote>',
            '</div>',
        '</blockquote>',
      '</div>'
    ].join(''),
    'Delete',
    [
      '<div contenteditable>',
        '<blockquote type="cite">blue',
          '<div><blockquote type="cite">|green</blockquote></div>',
        '</blockquote>',
      '</div>'
    ].join(''),
    'Step 1');

selection_test(
    [
      '<div contenteditable>',
        '<blockquote type="cite">blue',
          '<div><blockquote type="cite">|green</blockquote></div>',
        '</blockquote>',
      '</div>'
    ].join(''),
    'InsertNewlineInQuotedContent',
    [
      '<div contenteditable>',
        '<blockquote type="cite">blue</blockquote>',
        '|<br>',
        '<blockquote type="cite"><div><blockquote type="cite">green</blockquote></div></blockquote>',
      '</div>'
    ].join(''),
    'Step 2');

selection_test(
    [
      '<div contenteditable>',
        '<blockquote type="cite">blue</blockquote>',
        '|<br>',
        '<blockquote type="cite"><div><blockquote type="cite">green</blockquote></div></blockquote>',
      '</div>'
    ].join(''),
    'InsertText black',
    [
      '<div contenteditable>',
        '<blockquote type="cite">blue</blockquote>',
        'black|<br>',
        '<blockquote type="cite"><div><blockquote type="cite">green</blockquote></div></blockquote>',
      '</div>'
    ].join(''),
    'Step 3');
</script>