Qt SVG style element attribute type no default value "text/css"

 If a 'type' is not provided, the value of 'contentStyleType' on the 'svg' element shall be used, which in turn defaults to "text/css" [RFC2046. If a 'style' element falls outside of the outermost svg element and the 'type' is not provided, the 'type' must default to "text/css" [RFC2046. 

SVG style element

in source  Src\qtsvg\src\svg\qsvghandler.cpp 
static bool parseStyleNode(QSvgNode *parent,
const QXmlStreamAttributes &attributes,
QSvgHandler *handler)
{
Q_UNUSED(parent);
#ifdef QT_NO_CSSPARSER
Q_UNUSED(attributes)
Q_UNUSED(handler)
#else
const QStringRef type = attributes.value(QLatin1String("type"));
if (type.compare(QLatin1String("text/css"), Qt::CaseInsensitive) ==0)
handler->setInStyle(true);
#endif

returntrue;
}