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chromium/third_party/blink/web_tests/editing/pasteboard/5006779.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="true" id="div">',
        '<br>',
        '<br>',
        '<blockquote type="cite">^On| Tuesday, Dave wrote:</blockquote>',
        '<blockquote type="cite"><br></blockquote>',
        '<blockquote type="cite">Hello World.</blockquote>',
      '</div>'
    ].join(''),
    selection => {
      const document = selection.document;
      document.execCommand('Copy');
      selection.collapse(document.getElementById('div'), 0);
      document.execCommand('PasteAndMatchStyle');
    },
    [
      '<div contenteditable="true" id="div">',
        'On|<br>',
        '<br>',
        '<blockquote type="cite">On Tuesday, Dave wrote:</blockquote>',
        '<blockquote type="cite"><br></blockquote>',
        '<blockquote type="cite">Hello World.</blockquote>',
      '</div>'
    ].join(''),
    'Copying and pasting less than a paragraph of quoted content. It should not appear quoted.');
</script>