fix: custom ident is not a custom element selector

[bartveneman]

closes #539

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.51%. Comparing base (a88adb7) to head (4062126).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #559      +/-   ##
==========================================
+ Coverage   95.00%   95.51%   +0.50%     
==========================================
  Files          18       18              
  Lines         981      981              
  Branches      310      310              
==========================================
+ Hits          932      937       +5     
+ Misses         40       36       -4     
+ Partials        9        8       -1     

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[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 33 bytes (0.04%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
analyzeCss-esm	77.85kB	33 bytes (0.04%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: analyzeCss-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
index.js	33 bytes	33.98kB	0.1%

Files in index.js:

• ./src/index.ts → Total Size: 26.41kB