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JavaScript Window Screen


The window.screen object contains information
about the user's screen.

Window Screen
The window.screen object can be written without the window prefix.
Properties:

screen.width
screen.height
screen.availWidth
screen.availHeight
screen.colorDepth
screen.pixelDepth


Window Screen Width
The screen.width property returns the width of the visitor's screen in
pixels.

Example
Display the width of the screen in pixels:

document.getElementById("demo").innerHTML ="Screen Width: " + screen.width;

Result will be:





Try it Yourself »


Window Screen Height
The screen.height property returns the height of the visitor's screen in pixels.

Example
Display the height of the screen in pixels:

document.getElementById("demo").innerHTML ="Screen Height: " + screen.height;

Result will be:





Try it Yourself »








Window Screen Available Width
The screen.availWidth property returns the width of the visitor's screen, in
pixels,
minus interface features like the Windows Taskbar.

Example
Display the available width of the screen in pixels:

document.getElementById("demo").innerHTML ="Available Screen Width: " + screen.availWidth;

Result will be:





Try it Yourself »


Window Screen Available Height
The screen.availHeight property returns the height of the visitor's screen,
in pixels, minus interface features like the Windows Taskbar.

Example
Display the available height of the screen in pixels:

document.getElementById("demo").innerHTML ="Available Screen Height: " + screen.availHeight;

Result will be:





Try it Yourself »


Window Screen Color Depth
The screen.colorDepth property returns the number of bits used to display one color.
All modern computers use 24 bit or 32 bit hardware for color resolution:

24 bits =      16,777,216 different "True Colors"
32 bits = 4,294,967,296 different "Deep Colors"

Older computers used 16 bits: 65,536 different "High Colors" resolution.
Very old computers, and old cell phones used 8 bits: 256 different "VGA colors".

Example
Display the color depth of the screen in bits:

document.getElementById("demo").innerHTML = "Screen Color Depth: " + screen.colorDepth;

Result will be:





Try it Yourself »


The #rrggbb (rgb) values used in HTML represents "True Colors" (16,777,216 different colors)


Window Screen Pixel Depth
The screen.pixelDepth property returns the pixel depth of the screen.

Example
Display the pixel depth of the screen in bits:

document.getElementById("demo").innerHTML ="Screen Pixel Depth: " + screen.pixelDepth;

Result will be:





Try it Yourself »


For modern computers, Color Depth and Pixel Depth are equal.













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Reference: https://www.w3schools.com/js/js_window_screen.asp