OK Thanks, I guess I was hoping for more of an automatic way :-D, kind of like a project setting or export dialog setting "Center game canvas in browser window" and "Add cool gray border to game canvas". I mean, the code is already written for the preview, why not make it available in the exported game?
I export and upload a lot because I need to test on the real server (some AJAX stuff at work), that's why I'm a bit reluctant to manual work :D but if it must be done, then it must be done. It would be nice to have it automatic though.
I haven't looked closely at the SDK and ways to extend Construct 2, would it be possible for me to add those checkboxes to project settings or export dialog? (like some plugin, or add-on etc...)