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 <body> tag:
<body class="holmes-debug">
It will catch common errors, like give all <image> tags without an alt attribute a 2 pixel red outline. There are actually three colors, red (error), yellow (warning, potentially bad practice) and dark grey (deprecation). Hovering over most of these gives you a description, so you know what the problem is (or might be).
Checkout the source on GitHub!
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