static expectToEqualElementCompare_(actual, expected) {
    const diff =
        shaka.test.Util.expectToEqualElementRecursive_(actual, expected);
    const result = {};
    result.pass = diff == null;
    if (result.pass) {
      result.message = 'Expected ' + actual.innerHTML + ' not to match ';
      result.message += expected.innerHTML + '.';
    } else {
      result.message = 'Expected ' + actual.innerHTML + ' to match ';
      result.message += expected.innerHTML + '. ' + diff;
    }
    return result;
  }
@param {?} actual
@param {!Element} expected
@return {!Object} result
@private