Get the size of the screen, current web page and browser window

Question

How can I get windowWidth, windowHeight, pageWidth, pageHeight, screenWidth, screenHeight,

Answer 1

I developed a library for knowing the real viewport size for desktops and mobiles browsers, because viewport sizes are inconsistents across devices and cannot rely on all the answers of that post (according to all the research I made about this) : https://github.com/pyrsmk/W