Holmes.css - CSS Markup Detective. What does it do? The holmes.css file will display either an error (red outline), a warning (yellow outline), or a deprecated style (dark grey outline) for flags such as: Missing required attributes on tags, such as name attributes on inputs (lots of these) Potentially improvable markup, such as links with href="#" Deprecated and Non-W3C Elements - see W3C.org's article on obselete tags Non-W3C Attributes - as above, just the most important ones since there are MANY Thanks to Anthony Mann, holmes now displays an informative error message when you hover over the element.
Support for :after/::after on images is non-existent however in most browsers. How do I use it? Simply download a version of the CSS, minified or normal (with docs), and include a stylesheet link to it on your page. In terms of configuration, such as changing the flag colours: go nuts! Why should I use it? Browser Support Works 100% in Google Chrome 10+ Safari 5+ Opera 10+ Firefox 3.5+ PhantomJS: Headless WebKit with JavaScript API. CasperJS, a navigation scripting and testing utility for PhantomJS. Create a new Fiddle - jsFiddle - Online Editor for the Web (JavaScript, MooTools, jQuery, Prototype, YUI, Glow and Dojo, HTML, CSS)
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