HTML Validator

HTML validation is a process of checking your HTML code against the official HTML standards to ensure it's properly formatted and structured. Valid HTML is important for several reasons:

Why Validate HTML?

• Better Browser Compatibility: Valid HTML renders more consistently across different browsers.
• Improved Accessibility: Properly structured HTML helps screen readers and other assistive technologies.
• SEO Benefits: Search engines can better understand and index valid HTML content.
• Easier Maintenance: Clean, valid code is easier to update and maintain.
• Faster Rendering: Browsers process valid HTML more efficiently.

Common HTML Validation Issues

• Missing or incorrect DOCTYPE declaration
• Unclosed tags or improperly nested elements
• Invalid attributes or attribute values
• Missing required attributes (like alt for images)
• Use of deprecated HTML elements or attributes
• Duplicate IDs (each ID must be unique on a page)
• Incorrect character encoding

HTML5 Best Practices

• Always include a proper DOCTYPE declaration
• Use semantic HTML elements (nav, article, section, etc.)
• Ensure all tags are properly closed
• Use lowercase for all HTML element names and attributes
• Quote all attribute values
• Provide alternative text for images
• Validate forms with proper labels and input types