Validation of Your Web Site - W3C
An important part of SEO (Search Engine Optimization) is to make sure that a web site can be viewed correctly by Search Engines and Web Browsers. Validation ensures that a web site does not have any issues and is highly recommended. It's main functions are to check for missing tags, possible compatibility issues etc.
There are a few different types of validation. Whether a file on a web site is a html, css, rss or xml you can use the W3C web site to check for validation problems on a web site to make sure that the web site will be read and loaded correctly by Search Engines and Web Browsers.
HTML, XHTML, and XML Validation - Using the Validation tool provided by W3C will ensure that your web page doesn't have issues like missing tags (i.e. a starting tag but no ending tag) and gives general advice on how to make your web site friendlier to Web Browsers and Search Engines.
CSS Validation - The CSS Validation tool will check the code in a CSS file and check for duplication/obsolete CSS formatting..
RSS Validation - The RSS Validation tool will check that your RSS feed(s) are correct and not malformed. It will also notify you of possible incompatibilities of Feed Readers.
Link Checker - This validation tool checks the links on a web site and will inform you of possible broken links or redirected links..
This web site has validated all of its files (includes XHTML, CSS and RSS files). Below are a few of the certification images that you can place on your web site to show that your web page has been validated.
