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system-property - XPath | MDN
The system-property function returns an object representing the given system-property.
name (optional)
The name of the system property. The argument must evaluate to a string that is a QName. The QName is expanded into a name using the namespace declarations in scope for the expression. The system-property function returns an object representing the value of the system property identified by the name. If there is no such system property, the empty string should be returned.
An object representing the given system-property.
xsl:version, a number giving the version of XSLT implemented by the processor; for XSLT processors implementing the version of XSLT specified by this document, this is the number 1.0
xsl:vendor, a string identifying the vendor of the XSLT processor
xsl:vendor-url, a string containing a URL identifying the vendor of the XSLT processor; typically this is the host page (home page) of the vendor's website.
