Re: version attribute of svg element

>> Can the version attribute validly be absent in an SVG 1.1 document? Is 
>> your answer documented in the SVG spec anywhere?
> 
> I would say it is not required, but I don’t believe it is documented 
> anywhere.

If the SVG 1.1 DTD is of any authoritative answer here, there it's 
defined as:

     <!ATTLIST %SVG.svg.qname;
     ...
         version %Number.datatype; #FIXED '1.1'
     ...
     >

(https://www.w3.org/Graphics/SVG/1.1/DTD/svg-structure.mod)

Remembering from the Olden Days that #FIXED in DTDs means, that an 
#FIXED attribute is not literally required in the XML source, the DTD 
says you can omit it.

-Manuel