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

With the introduction of globalThis in ES2020 you can use properties like.

For screen size:

globalThis.screen.availWidth 
globalThis.screen.availHeight

For Window Size

globalThis.outerWidth
globalThis.outerHeight

For Offset:

globalThis.pageXOffset
globalThis.pageYOffset

...& so on.

alert("Screen Width: "+ globalThis.screen.availWidth +"\nScreen Height: "+ globalThis.screen.availHeight)