For SVG to be truly turing complete in the sense of being able to run arbitrarily long tasks, it must have its output fed to it's input--- a sort of driven turing machine. However, this loop can be unrolled an arbitrary non-infinite length, so tasks of known maximum complexity can be computed in one go...\
With this out of the way and apologies for being misleading:\
SVG Is Turing Complete
Scalable Vector Graphics is an XML based language with significant image processing capabilities, and here I demonstrate that these capabilities breach turing completeness.
The turing machine I choose to emulate to prove SVG's turing completeness is rule 110.
Chromium 73.0.3683.103 after several seconds, seriously, this thing is slow!
Behold the monstrocity in-browser here.
Technical information found in the source, for those further interested.