nsString& aResult) const
nsAWritableString& aResult) const
nsHTMLBRElement::AttributeToString(nsIAtom* aAttribute,                                   const nsHTMLValue& aValue,                                   nsString& aResult) const{  if (aAttribute == nsHTMLAtoms::clear) {    if (eHTMLUnit_Enumerated == aValue.GetUnit()) {      nsGenericHTMLElement::EnumValueToString(aValue, kClearTable, aResult);      return NS_CONTENT_ATTR_HAS_VALUE;    }  }  return mInner.AttributeToString(aAttribute, aValue, aResult);}