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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:

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:

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:

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:

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:

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:

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


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