I am a c++ dev new to web. How do a design page content for all screen sizes, resolution, window sizes.
I am using createjs and I am developing a gamified content. I am specifying the object layout and sizes as a perecent of the visible window.

But not clear if this is enough and not clear what the visible window is in all environments.

Can you suggest?
Is there a standard document, book or tutorial that discusses this.