fix block-level syntax inference inside arbitrary HTML

[quantizor]

Fixes #168

[codecov]

Codecov Report

Merging #169 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #169   +/-   ##
=======================================
  Coverage   99.71%   99.71%           
=======================================
  Files           1        1           
  Lines         345      345           
  Branches       51       51           
=======================================
  Hits          344      344           
  Misses          1        1

Impacted Files	Coverage Δ
index.js	99.71% <100%> (ø)	⬆️

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