Learn HTML with Real Code Examples
Updated Nov 21, 2025
Performance Notes
HTML is lightweight and fast to load
Proper semantic structure improves rendering efficiency
Minimize inline styles to improve load performance
Use external scripts and stylesheets for caching
Reduce unnecessary elements and comments
Security Notes
Sanitize user inputs in forms
Avoid inline scripts to prevent XSS
Use HTTPS for secure content delivery
Validate forms on client and server side
Ensure media files are safe and virus-free
Monitoring Analytics
Use browser dev tools to inspect DOM
Check performance and load times
Audit accessibility with Lighthouse
Monitor SEO with structured data
Test cross-browser compatibility
Code Quality
Validate HTML syntax
Use semantic and accessible elements
Keep markup clean and organized
Separate concerns with CSS and JS
Comment and document structure as needed