YAML Debug is an assistive tool for web developers, that allows you to quickly review code quality and semantic structure of any website (particularly based on YAML) as well as testing it against common oversights.

YAML Debug detects the content encoding and counts all external style sheets, script elements and images on your webpage. In the style sheet tab, all external and embedded style sheets are listed in source order. By clicking on a style sheet, it can be disabled or enabled. YAML Debug lets you easily visualize the semantic code structure of any webpage, giving you a quick overview whether it has meaningful semantics or not.

Requirements: Firefox 3.x, Opera 9.x
Demo: http://debug.yaml.de/
License: License Free