HTML Validator
Check HTML code for syntax errors and standards compliance. Validate markup structure, detect missing tags, and ensure accessibility standards. Perfect for front-end developers.
HTML Standards Guide
✓ Best Practices
- • Always include DOCTYPE declaration
- • Use semantic HTML elements
- • Include lang attribute on html element
- • Provide alt text for images
- • Use proper heading hierarchy (h1-h6)
- • Include viewport meta tag
- • Use meaningful page titles
- • Associate labels with form inputs
✗ Common Mistakes
- • Missing DOCTYPE declaration
- • Unclosed or mismatched tags
- • Missing alt attributes on images
- • Empty or missing title elements
- • Improper heading hierarchy
- • Missing form labels
- • Using deprecated HTML elements
- • Missing meta viewport tag
Sample HTML Code
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