If you have just finished a new XHTML document, and you want to make sure that confirms with the XHTML specification, you can use the XHTML online validator at http://validator.w3.org/.
There are 3 ways you can use this validator:
- By URL - Specify the URL where your XHTML document is located, and click "Check".
- By File Upload - Use the "Browse" to locate an XHTML document on your local hard disk, and click "Check".
- By Direct Input - Copy & paste the content of an XHTML document to the input area, and click "Check".
The validator will return a page with validation result.