no-duplicate-in-head

Detect duplicate charset/viewport/description meta.

Severity

error

❌ Incorrect

<meta charset="utf-8">
<meta charset="utf-8">

✅ Correct

<meta charset="utf-8">

Reference

• HTML Standard - The head element

Configuration

{
  "rules": {
    "no-duplicate-in-head": "error"
  }
}