fix: the ASCII whitespaces are preserved so can not be escaped

[JounQin]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

close #1626

Breaking Changes

N/A

Additional Info

related https://infra.spec.whatwg.org/#ascii-whitespace

cc @alexander-akait

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.52%. Comparing base (f5be49c) to head (cdb15b0).
Report is 43 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1632      +/-   ##
==========================================
+ Coverage   96.15%   96.52%   +0.37%     
==========================================
  Files          10       10              
  Lines        1196     1210      +14     
  Branches      461      462       +1     
==========================================
+ Hits         1150     1168      +18     
  Misses         37       37              
+ Partials        9        5       -4     

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[alexander-akait]

Looks good for, will wait your answer before merge