fix: style & custom SVG properties

[gregberge]

Closes #199

Closes #201

[vercel]

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[codecov]

Codecov Report

Merging #203 into master will decrease coverage by 0.16%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
- Coverage   85.74%   85.57%   -0.17%     
==========================================
  Files          24       24              
  Lines         519      520       +1     
  Branches      103      103              
==========================================
  Hits          445      445              
- Misses         66       67       +1     
  Partials        8        8

Impacted Files	Coverage Δ
packages/core/src/h2x/titleProp.js	73.52% <100%> (-2.23%)	⬇️

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