Is there a single HTML5, JavaScript, and CSS debugger?

Question

I know that there is a varity of HTML5 debuggers (such as in Dreamweaver), a vareity of JavaScript (such as JSLint), and CSS debuggers (such as Firebug), but is there a sing

Answer 1

I just released a tool that allows you to visualize your HTML / CSS layout just by moving the mouse. It doesn't do it all, but its easy and its great for viewing layout problems.

HTML Box Visualizer - GitHub