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chromium/third_party/blink/web_tests/editing/spelling/no_marker_in_blurred_input.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script src="spellcheck_test.js"></script>
<input id=input>
<textarea id=textarea></textarea>
<script>
spellcheck_test(
    '<input>',
    document => {
      const input = document.querySelector('input');
      document.getSelection().setClipboardData('zz.');
      input.focus();
      document.execCommand('paste');
      document.execCommand('paste');
      input.blur();
    },
    '<input value="zz.zz.">',
    'Markers should not be added to INPUT without focus.');
</script>