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 96.28%. Comparing base (f5be49c) to head (902754f).
Report is 48 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1632      +/-   ##
==========================================
+ Coverage   96.15%   96.28%   +0.12%     
==========================================
  Files          10       10              
  Lines        1196     1210      +14     
  Branches      461      465       +4     
==========================================
+ Hits         1150     1165      +15     
- Misses         37       40       +3     
+ Partials        9        5       -4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[alexander-akait]

Looks good for, will wait your answer before merge

[snitin315]

LGTM, thanks!

[JounQin]

@alexander-akait @snitin315 Any ETA to merge and release?

[alexander-akait]

@JounQin this week

[JounQin]

Friendly ping @alexander-akait @snitin315 @ersachin3112

[JounQin]

@alexander-akait Hi, why this PR is closed?

[JounQin]

@alexander-akait News?

[alexander-akait]

@JounQin Oh, sorry, looks like by mistake, but looks like the branch is deleted, I can't reopen, do you try experiments.css? It is replace for css-loader, style-loader and mini-css-extract-plugin (faster and without bugs), just want to get feedback, if you need examples feel free to look webpack/examples/css, we want to deprecated these packages soon (after the next minor release in favor of experiments.css), anyway I can merge it and make a release

[JounQin]

@alexander-akait Thanks, that's weird I didn't delete the branch, but can recreate the PR. I'll try experiments.css later, but that's a different task, thanks!

[JounQin]

@alexander-akait #1668