chromium/third_party/blink/web_tests/editing/pasteboard/paste_div_with_style.html

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
test(() => {
  if (!window.testRunner) {
    assert_unreached('This test should be run with testRunner.');
    return;
  }

  assert_selection(
    [
      '<div contenteditable>',
        '<div>',
          '^foo',
          '<div style="color: rgb(255, 0, 0);">',
          '<div>bar|</div>',
        '</div>',
      '</div>',
    ].join(''),
    selection => {
      selection.document.execCommand('copy');
      selection.document.execCommand('paste');
    },
    [
      '<div contenteditable>',
        'foo',
        '<div style="color: rgb(255, 0, 0);">',
          'bar|',
        '</div>',
      '</div>',
    ].join(''));
}, 'paste should not create empty style or font tags');
</script>