A unique take on HTML ‘validation’, Luke Williams has made finding erroneous markup elementary. It’s a two step process: add the stylesheet to your markup, and add the following class to the
It will catch common errors, like give all
<image> tags without an
alt attribute a 2 pixel red outline. There are actually three colors, , and . Hovering over most of these gives you a description, so you know what the problem is (or might be).
Checkout the source on GitHub!