Easily test your website in more than 70 tools.
Site Check saves you time—fill out only one form instead of a dozen when checking a website. Site Check lists links to test results provided by important validators and testing tools.
Additionally, there’s a Site Check Bookmarklet.
A bookmarklet is a little JavaScript snippet contained in a hyperlink. Nearly all browsers allow you to bookmark these links like any other links. Steve Kangas and Tantek Çelik, among others, published other useful bookmarklets.