- HTML Tutorial
- HTML - Home
- HTML - History and Evolution
- HTML - Overview
- HTML - Editors
- HTML - Basic Tags
- HTML - Elements
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- HTML - Formatting
- HTML - Headings
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- HTML - Phrase Tags
- HTML - Meta Tags
- HTML - Style Sheet
- HTML - CSS Classes
- HTML - CSS IDs
- HTML - Images
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- HTML Tables
- HTML - Tables
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- HTML - Nested Tables
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- HTML - Definition Lists
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- HTML Colors
- HTML - Colors
- HTML - RGB
- HTML - HEX
- HTML - HSL
- HTML Forms
- HTML - Forms
- HTML - Form Attributes
- HTML - Form Control
- HTML - Input Attributes
- HTML Media
- HTML - Video Element
- HTML - Audio Element
- HTML - Embed Multimedia
- HTML Header
- HTML - Head Element
- HTML - Adding Favicon
- HTML - Javascript
- HTML Layouts
- HTML - Layouts
- HTML - Layout Elements
- HTML - Layout using CSS
- HTML - Responsiveness
- HTML - Symbols
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- HTML - Style Guide
- HTML Graphics
- HTML - SVG
- HTML - Canvas
- HTML APIs
- HTML - Geolocation API
- HTML - Drag & Drop API
- HTML - Web Workers API
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- HTML - Server Sent Events
- HTML Miscellaneous
- HTML - MathML
- HTML - Microdata
- HTML - IndexedDB
- HTML - Web Messaging
- HTML - Web CORS
- HTML - Web RTC
- HTML Demo
- HTML - Audio Player
- HTML - Video Player
- HTML - Web slide Desk
- HTML Tools
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- HTML - QR Code
- HTML - Modernizer
- HTML - Validation
- HTML - Color Code Builder
- HTML References
- HTML - Tags Reference
- HTML - Attributes Reference
- HTML - Events Reference
- HTML - Fonts Reference
- HTML - ASCII Codes
- ASCII Table Lookup
- HTML - Color Names
- HTML - Entities
- MIME Media Types
- HTML - URL Encoding
- Language ISO Codes
- HTML - Character Encodings
- HTML - Deprecated Tags
- HTML Resources
- HTML - Quick Guide
- HTML - Useful Resources
- HTML - Color Code Builder
- HTML - Online Editor
HTML - Validation
An HTML validator is a tool that parses each line of code in order to find syntax errors and to check whether the HTML and CSS codes comply with the latest standards set by the World Wide Consortium (W3C).
The most frequently used validators are as follows −
The W3C Markup Validator
The W3C Markup Validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. This validator is part of Unicorn, W3C's unified validator service.
To use this validator for HTML, you need to use More Options and select Document Type as HTML (experimental) as shown below.
The Validator.nu (X)HTML Validator
Here is the another currently known HTML5 validators: Henri's Validator.nu (X)HTML5 Validator (Highly Experimental) −
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