For HTML panel's use the Chrome Debugger. Is it not working for you? Which version?
http://www.davidebarranca.com/2014/01/html-panels-tips-1-debugging/
For HTML panel's use the Chrome Debugger. Is it not working for you? Which version?
http://www.davidebarranca.com/2014/01/html-panels-tips-1-debugging/