fix: more robust mapping for conversion to HTML

[adbar]

fixes #701.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.90%. Comparing base (1c33d10) to head (d51551c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #721   +/-   ##
=======================================
  Coverage   98.90%   98.90%           
=======================================
  Files          21       21           
  Lines        3482     3484    +2     
=======================================
+ Hits         3444     3446    +2     
  Misses         38       38           

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