HTML & CSS Version Checker.
Analyze your website's HTML and CSS versions, feature support, and compatibility with modern web standards.
Understanding Web Standards
Modern web development relies on following established standards to ensure compatibility, accessibility, and performance.
HTML Standards
HTML5
The current standard with rich semantic elements and multimedia support
Semantic Elements
Improve accessibility and SEO with meaningful structure
Form Features
Modern input types and validation for better user experience
CSS Features
Modern Layout
Flexbox and Grid for responsive designs
Animations & Transitions
Smooth visual effects for better interactivity
Custom Properties
Variables for maintainable styling
Best Practices
- Keep your DOCTYPE declaration current
- Use semantic HTML elements appropriately
- Implement modern CSS features when possible
- Include proper meta tags for SEO
- Test across different browsers
Browser Support
Modern features are well-supported across current browsers. However, if you need to support older browsers, consider:
- Progressive enhancement strategies
- Fallback styles for older browsers
- Feature detection using @supports
- Polyfills for critical features
How it works
Four steps.
- 01
Enter the website URL you want to analyze
- 02
Get detailed analysis of HTML and CSS versions
- 03
Review feature support and compatibility
- 04
Get recommendations for improvements
Features
Comprehensive Analysis.
HTML Version Detection
Detect HTML version and doctype with semantic element analysis.
CSS Analysis
Analyze CSS versions and modern feature usage across stylesheets.
Feature Support
Check for modern web features and browser compatibility.
Deep Analysis
Comprehensive scanning of external resources and dependencies.
Issue Detection
Identify potential compatibility issues and outdated features.
Meta Information
Extract and analyze meta tags and document structure.
Why check HTML & CSS versions?
Checking HTML and CSS versions is important for: Ensuring browser compatibility Identifying modernization opportunities Maintaining web standards compliance Optimizing performance Planning updates and improvements
What features are checked?
Our tool analyzes multiple aspects: HTML version and doctype Semantic HTML elements CSS version and features Modern CSS properties Meta tags and structure Multimedia elements
How to interpret the results?
The results show: Current HTML/CSS versions in use Support for modern features Potential compatibility issues Recommendations for improvements Green indicators show modern features, while yellow or red indicate areas for improvement.
What should I update?
Consider updates when you see: Older HTML versions (pre-HTML5) Limited CSS feature usage Missing semantic elements Deprecated features Focus on areas that impact user experience and maintainability.
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Built by Infyways
Need more than a tool.
These utilities are made by the Infyways studio. When a free tool is not enough, we build the real thing.
