Web page validator
Validator is a software program that can check whether the standard for Web pages.
When using validators to check HTML, XHTML or CSS files, the validator will return a list of errors according to the criteria you select.
Before you publish the page Make sure that you verified all pages symbol W3C standards.
Verify that the HTML file by W3C:
Validate CSS files by W3C:
Verify XHTML file by W3C:
XHTML documents based on the document type declaration (DTD) for authentication.
In our HTML tutorial you can read more about XHTML tutorial information .
XML syntax validation
Check out this site validate XML syntax validation address: http://www.w3big.com/dom/dom-validate.html .