I am just amazed by the thoughts that people get while creating tools. Here is a beautiful website that check the design of any website, popularity of a website and accessibility of the website.
It does about 130 tests on Basic HTML, Frames etc.
Here is the link.
http://sitescore.silktide.com/
Check your website and fix the issues it says … it really means what it says.
Also for your further reference you can use another cool web based siteperformance tool. That is netmechanic you can visit http://www.netmechanic.com for more details.