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chromium/third_party/blink/web_tests/editing/pasteboard/paste-unstyled-link.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
// crbug.com/1047806
selection_test(
  '<div contenteditable style="font-size: 12px">|</div>',
  selection => {
    selection.setClipboardData('<meta charset="utf-8"><a href="http://example.com/">http://example.com/</a>');
    selection.document.execCommand('paste');
  },
  '<div contenteditable style="font-size: 12px"><a href="http://example.com/">http://example.com/|</a></div>',
  'Pasting should not add additional font-size inline styles to unstyled clipboard markup');
</script>