In general it's the beginning <svg viewBox="0 0 1536 754"
who has not "." or bad "," or... who makes the no loading inside MOI!

Not yet found the good syntax! :)

here my file svg generated from the program (first post) https://cs.uwaterloo.ca/~csk/hat/app.html

https://moiscript.weebly.com/uploads/3/9/3/8/3938813/output.svg

Should be something like that...or similar!