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Inventory all HTML5 semantic elements (main, nav, article, section, aside, header, footer, figure, time, details). Calculate your div-to-semantic ratio, check ARIA landmarks, and identify opportunities to improve machine readability.
Best for
Use this tool when you need one sharp answer fast before opening a broader report.
The input and results are designed to stay readable and tappable on smaller screens.
This page targets both broad keywords and practical queries people use before they audit a specific domain.
Frequently asked questions
Yes — the Semantic HTML Checker is 100% free with no signup, no account, and no usage limits. Just enter a URL and get instant results.
Our Semantic HTML Checker runs live checks against the target website in real time. Results reflect the current state of the site at the moment you run the check — not cached or historical data.
Semantic HTML uses meaningful tags (main, article, nav, section, aside, figure, time) instead of generic divs. AI crawlers and screen readers use these elements to understand your page structure, identify main content, and extract information accurately.
A ratio above 15% is considered good. This means at least 15% of your container elements are semantic rather than generic divs. Higher ratios indicate better machine readability and accessibility.
AI models like GPTBot and ClaudeBot use semantic structure to understand which parts of your page are main content vs. navigation or ads. Proper semantic HTML helps AI extract the right content for citations and answers.