A technique that I've been using is to make the room size some arbitrarily large value like 1960x1080 then using window_center() to place the canvas in the centre of the browser, making it essentially fullscreen. Then you can use room_width, room_height, browser_width and browser_height to find the coordinates of the top left corner of the screen and place objects relative to that, for example:
STEP EVENT: window_center(); x0 = max(0, (room_width - browser_width) / 2); y0 = max(0, (room_height - browser_height) / 2);
I'm a total noob here, I don't quite understand what x0 and y0 are.



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