doctype 🔧
Require DOCTYPE declaration.
Severity
error
❌ Incorrect
html
<html lang="en"><head><title>T</title></head><body><h1>T</h1></body></html>✅ Correct
html
<!DOCTYPE html>
<html lang="en"><head><title>T</title></head><body><h1>T</h1></body></html>Reference
Configuration
json
{
"rules": {
"doctype": "error"
}
}