aOutputString.Append(NS_LITERAL_STRING("auto"));
aOutputString.AppendLiteral("auto");
void ProcessMarginLeftValue(const nsAString * aInputString, nsAString & aOutputString,                            const char * aDefaultValueString,                            const char * aPrependString, const char* aAppendString){  aOutputString.Truncate();  if (aInputString) {    if (aInputString->EqualsLiteral("center") ||        aInputString->EqualsLiteral("-moz-center")) {      aOutputString.Append(NS_LITERAL_STRING("auto"));     }    else if (aInputString->EqualsLiteral("right") ||             aInputString->EqualsLiteral("-moz-right")) {      aOutputString.Append(NS_LITERAL_STRING("auto"));     }    else {      aOutputString.Append(NS_LITERAL_STRING("0px"));     }  }}