how to check for html5/css3 compliant web pages [closed]

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We are building web based application front end for a web based application using HTML5/CSS3/JQUERY. We are using firebug at the moment which is not helping us good. I would like to know how can i ensure the pages are html5/css3 compliant. I am also looking for a plugin like firebug, which will help my team to make sure we are following best practices and while building quality front end for web based application for fortune 500 client.

If i could get a plugin or any link to web based open source application will be great!

Answer 1

You always want to run tests on here towards the end. But you can also run them periodically.

http://validator.w3.org/

Answer 2

As codehorse has said you can validate them on w3.org. There is an add on for firebug which can do this for you (I have never used it). https://addons.mozilla.org/en-US/firefox/addon/validator/

Just found this one while I was looking at other stuff https://addons.mozilla.org/en-US/firefox/addon/html-5-validator/?src=ss yet again not sure if it works.