#105 · CSS Developer Tool

CSS Inspector

Inspect CSS for specificity, duplicate declaration blocks, repeated colors, unit usage, custom properties, important declarations, selector depth, and maintainability concerns.

Developer Input

Local browser processing
Ad space

How to use this developer tool

  1. Paste or type the source in the input area.
  2. Select the processing mode and adjust the optional value.
  3. Run the tool or leave auto-run enabled for immediate results.
  4. Review warnings and statistics before copying or downloading the output.

What this developer tool does

Inspect CSS for specificity, duplicate declaration blocks, repeated colors, unit usage, custom properties, important declarations, selector depth, and maintainability concerns.

Input protection → structural scan → selected transformation or analysis → validation → copy-ready output and measured statistics.

Processing is performed locally. Advanced language edge cases may require a full standards-based parser or project-specific toolchain.

Example

Input:

.title { color: #8b5cf6; margin: 16px; }
.heading { color: #8b5cf6; margin: 16px; }
#app .nav ul li a.active { color: #8b5cf6 !important; }
Output: Run the included example to see a real result generated by this tool.

Tips for better output

  • Test converted code in the target browser or runtime.
  • Keep an original copy before applying automated changes.
  • Large inputs are processed locally; disable auto-run when editing very large files.
  • Pattern-based analysis may not cover every language edge case.

FAQ

How do I find duplicate CSS rules?

The inspector normalizes declaration blocks and groups selectors that use identical property-value sets.

How can I calculate CSS selector specificity?

Specificity is estimated as ID, class-like, and element-like counts for each selector.

How do I identify repeated colors in CSS?

The color report counts repeated HEX, RGB, and HSL tokens and highlights candidates for variables.

How can I measure CSS complexity?

The report combines rule count, selector depth, specificity, important usage, and duplication into a relative score.

How do I find CSS rules that should use variables?

Repeated color and spacing values are reported as potential custom-property candidates.

Supported analysis modules

ModulePurpose
StructureProtect strings and comments before scanning.
ProcessingApply the selected conversion, parser, validator, viewer, inspector, checker, or generator logic.
ReportingReturn output, status, measured size, lines, and practical notes.

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