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Validators and Lints
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  W3C HTML Validation Service - http://validator.w3.org/
World Wide Web Consortium validator.
  Web Page Backward Compatibility Viewer - http://www.delorie.com/web/wpbcv.html
Uncheck tags to be unsupported and see how the page looks.
  Validome Markup Validation Service - http://www.validome.org/
Multilingual validator for HTML, XHTML, and XML.
  WDG HTML Validator - HTML Help - http://www.htmlhelp.com/tools/validator/
Produces easy to read HTML error messages. Can validate one page or a batch of pages at one time.
  Web Page Purifier - http://www.delorie.com/web/purify.html
Check how a webpage looks with different HTML versions.
  HTML Tidy Online - http://infohound.net/tidy/
Cleans up coding errors, especially useful for deeply nested ones.
  Total Validator - http://www.totalvalidator.com/
Validator for WAI, XHTML, and HTML. Also checks for broken links and spelling mistakes.
  Validator-Lite - http://www.webthing.com/software/validator-lite/
Offers validator for HTML, XHTML, and DTD-based XML languages.
  HTML/XML Validator - http://validator.aborla.net/
Validates and repairs HTML, XHTML, and XML. Also includes accessibility checking.
  Validation Bookmarklets - http://www.squarefree.com/bookmarklets/validation.html
Javascript bookmarklets which check alt text, broken images, small screen readability, and HTML validity.
  Microsoft Word 2000 HTML Mess Cleaner - http://www.algotech.dk/word-html-cleaner-input.htm
Removes clutter from Microsoft Word 2000-generated HTML. ASP source code available for purchase.
  Web Validators - http://validator.czweb.org/
Links to validators for XHTML, HTML, CSS, RSS, XML, and RDF documents.
  Alpine HTML Doctor - http://www.alpineinternet.com/.docs/pg/11133
Identifies common HTML code errors, corrects the code, and generates a repair file for cut and paste back into a document.
  Web Mechanic - http://www.webmechanic.com.au/
Validator and lint eliminates redundant or conflicting tags and compresses image files. Pay service.
  HTML and XHTML Syntax Checker - http://www.freehtmlvalidator.com/onlineval.php
Locates webpage coding errors, lists error number and page source.
  XHTML CSS - http://xhtml-css.com/
Helps checking and suggesting corrections to web pages markup (HTML) and style (CSS) coding.
  Dr. Watson - http://watson.addy.com/
Checks HTML code, links, spelling, download time and link popularity.
  Pure PHP XHTML Validator - http://www.bermi.org/xhtml_validator
PHP class for validating XHTML documents. Source code available under LGPL.
  HTML Code Cleanup - http://www.htmlcodecleanup.com/
Validator and hand cleanup by professionals.
  Walidator - http://www.walidator.com/
Portal to several validators and URL analyzers.
  HTML Tidy Download - http://chami.com/html-kit/tidy/
HTML Tidy plugin. Fixes HTML and XHTML, converts HTML to XHTML.

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