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- 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, MobileOK content, or to find broken links, there are other validators and tools available
- Free Online HTML Validator - FreeFormatter. com
This free online HTML validator lets you validate your files against the w3c standards
- JSONLint - The JSON Validator
JSONLint is an online editor, validator, and formatting tool for JSON, which allows you to directly type your code, copy and paste it, or input a URL containing your code
- validator. w3. com
Online tool for validating web documents against W3C standards
- XML Validator Tool to validate XML online: XML Lint - Code Beautify
XML Validator works well on Windows, MAC, Linux, Chrome, Firefox, Edge, and Safari This XML Linter helps a developer who works with XML data to test and verify
- HTML Validator - CSS Portal
Free online HTML validator built by CSSPortal Validate HTML5 code instantly in your browser - no data sent to third-party servers Checks structure, accessibility, deprecated tags, nesting, forms, and more
- Website Validator - data·yze
The Website Validator will break down errors and warnings by type, as well as give you the overall percentage of error free pages In the Error Summary tab you'll find a detailed description of all the errors encountered on your site
- Schema Markup Validator
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