don't use dataset with svg elements

[Rich-Harris]

fixes #982

[codecov-io]

Codecov Report

Merging #995 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #995   +/-   ##
=======================================
  Coverage   91.99%   91.99%           
=======================================
  Files         115      115           
  Lines        4271     4271           
  Branches     1359     1359           
=======================================
  Hits         3929     3929           
  Misses        148      148           
  Partials      194      194

Impacted Files	Coverage Δ
src/generators/nodes/Attribute.ts	85.18% <100%> (ø)	⬆️

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