i need code for html validation to host in my web. in which site i can download the code . any one help me.

Is there a reason that you can't use the W3C validator (http://validator.w3.org/)?

Edit: it has source available too (http://validator.w3.org/source/).

no i need a validation tool in my page

I don't think u can get that code to put it on your site

Please help me to do so. i am doing my project work on that

try to contact w3c

As far as I am aware, one of our customers has tried to get a validation tool on there site for people to use.

All you can do is put the W3C logo at the bottom of the pages which validate that page. They looked for a long time into putting a validation on there page for people to use but had no joy.

If that doesn't suffice maybe you could use cURL or something to validate through them and fetch back the info.