CSS Specificity Calculator

Paste one selector per line to rank specificity and review ID-heavy selectors and modern pseudo-class specificity rules.

Selectors — one per line

Selector specificity only. This does not model cascade origin, layers, !important, scoping proximity, inline declarations, or source order. Common Selectors Level 4 patterns are handled; unusual shadow-DOM and escaped-selector edge cases should be verified in DevTools.

Runs locally in your browser. Generated CSS is not deployed or tested against your site automatically.

Production CSS handoff

Review the CSS you will actually ship

This panel stays locked until you review the generated output above. It checks output shape, feature dependencies, motion/fallback concerns and creates a copy-ready component handoff.

Waiting for generated CSS

Output shapeLocked

Declarations—

UTF-8 bytes—

Browser preflightGenerate first

Features detected

Production findings

Copy-ready handoff

Generated component handoff will appear here.

Browser support is checked against the browser running this page, not every browser you support. Treat this as a production preflight, then test the copied CSS in your real component, content, cascade and target browser matrix.

What this CSS result proves

Specificity predicts selector precedence, not the whole cascade.

What to review before production

Layer order, origin, importance and source order still matter; use the score to reduce override cost, not to win specificity wars.