no-obsolete-doctype 🔧

Detect legacy XHTML/HTML4 doctypes.

Severity

warning

❌ Incorrect

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">

✅ Correct

<!DOCTYPE html>

Reference

• HTML Standard - The DOCTYPE

Configuration

{
  "rules": {
    "no-obsolete-doctype": "warning"
  }
}