Fix data URLs with spaces

[raviqqe]

Close #345.

References

• https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URLs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f04965c) 87.34% compared to head (b40f6ae) 87.50%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #349      +/-   ##
==========================================
+ Coverage   87.34%   87.50%   +0.15%     
==========================================
  Files          30       30              
  Lines         861      872      +11     
==========================================
+ Hits          752      763      +11     
  Misses         88       88              
  Partials       21       21              

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