PUBLIC MARKS with tags outils & debug

an assistive tool for web developers, that allows you to quickly review code quality and semantic structure of any website

Welcome to Opera Dragonfly alpha, the foundations of Opera's upcoming Developer Tools. Debug JavaScript, inspect CSS and the DOM, and view any errors – Opera Dragonfly makes developing using Opera easier than ever, both on your computer and mobile phone. Check out our alpha release for a taste of things to come.

Need to track down those nasty ones, but don't know where to start? CodeInvestigator tracks everything! Any point in the run is instantly accessible. Debug at any point and in any direction. Scroll the code to the line you're interested in and click the variable. Its value is then displayed between the code lines.

There are excellent tools to help write and debug Javascript - it isn't all about liberally using alert() any more!