paste-blockquote-and-paragraph-break.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 id="div">',
        '<br>',
        '<blockquote type="cite" id="blockquote">^hello<br></blockquote>',
        '|<br>',
      '</div>'
    ].join(''),
    selection => {
      const div = selection.document.getElementById("div");
      selection.document.execCommand('Copy');
      selection.collapse(div, 0);
      selection.document.execCommand('Paste');
    },
    [
      '<div contenteditable id="div">',
        '<blockquote id="blockquote" type="cite">hello|<br></blockquote>',
        '<blockquote id="blockquote" type="cite">hello<br></blockquote>',
        '<br>',
      '</div>'
    ].join(''),
    'Copy and paste a blockquoted paragraph plus a paragraph break The',
    'paragraph break should be inside the blockquote on paste.');
</script>

chromium/third_party/blink/web_tests/editing/pasteboard/paste-blockquote-and-paragraph-break.html