The W3C Markup Validation Service
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, …
Free Online HTML Validator - FreeFormatter.com
This free online HTML validator lets you validate your files against the w3c standards
Validator - Wikipedia
Validator Look up validator in Wiktionary, the free dictionary. A validator is a computer program used to check the validity or syntactical correctness of a fragment of code or document. The …
validator.w3.com
Online tool for validating web documents against W3C standards.
Validator - Glossary - MDN
Jul 11, 2025 · A validator is a program that checks for syntax errors in code. Validators can be created for any format or language, but in our context we speak of tools that check HTML, …
HTML Validator Online - AppDevTools
HTML Validator is a free online developer tool to validate HTML code against the W3C standards as known as HTML linter instantly. Supports partial HTML code validation. You can either …
Validation - Laravel 12.x - The PHP Framework For Web Artisans
Laravel is a PHP web application framework with expressive, elegant syntax. We’ve already laid the foundation — freeing you to create without sweating the small things.