Duplicate declaration

Diagnosis

What this finding means

The same property appears more than once in one rule, so the later value overrides the earlier value.

A finding is not a verdict. Check the displayed evidence and the design intent before changing production code.

Detection

How CSS Doctor detects it

1. CSS Doctor isolates the pasted HTML and CSS in a sandboxed iframe.
2. Static rules inspect source structure; runtime rules measure the rendered result.
3. Evidence is ranked by intent, severity, confidence, affected area, and fix safety.

Before / After

Minimal example

.card {
  color: #222;
  color: #445;
}

.card {
  color: #445;
}

The example is a starting point, not a universal patch. CSS Doctor previews Tier A and B changes before applying them and never auto-applies Tier C guidance.

Limitations

Limits and manual checks

Some duplicates are deliberate fallbacks; preview before removing different values.

• Production stylesheets not pasted into the tool are not fetched.
• JavaScript is never executed from user input.
• Verify the result at all breakpoints and with keyboard input.