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chromium/third_party/blink/web_tests/editing/deleting/5300379.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
// Test to see if deleteWordBackward: hangs.
selection_test(
    [
      '<div></div>',
      `<div contenteditable>|</div>`,
      '<div></div>',
    ],
    selection => {
      if (!window.testRunner)
        throw 'This test requires testRunner.execCommand()';
      testRunner.execCommand('DeleteWordBackward');
    },
    [
      '<div></div>',
      '<div contenteditable>|</div>',
      '<div></div>',
    ],
    'DeleteBackward by word in an empty div should not hang.');
</script>