So if I add break points in .dart files that are located in /web directory of my project, it works fine. For example I\'m using AngularDart and the main.dart file works. How
If you set break pointors from Dart Editor, then you should run your application from Dart Editor.
If you're using Dartium only, then you should set break pointors from Chrome Developer Tool. (Accepted answer)
Chrome Developer Tool