HTML Validation Checklist Before Going Live
25 essential checks to run before deploying your website. Covers HTML structure, SEO, accessibility, social sharing, and performance. Use the ValidateHTML validator to automate most of these checks. HTML Structure [ ] Valid DOCTYPE declaration - Every page starts with <!DOCTYPE html> . Without it, browsers switch to quirks mode and render inconsistently. [ ] No unclosed tags - Every opening tag has a matching closing tag. Unclosed divs and spans cascade layout bugs. [ ] Proper nesting - Tags are nested correctly. No <div><p></div></p> patterns that break document structure. [ ] No duplicate IDs - Every id attribute is unique on the page. Duplicate IDs break JavaScript selectors and accessibility. [ ] Valid character encoding - <meta charset="UTF-8"> is the first tag in <head> . Prevents garbled characters on international content. [ ] Language attribute set - <html lang="en"> is set. Helps screen readers pronounce content correctly and search engines serve the right version. SEO Essent
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