Flash cards
Review the key moves
What is the main idea behind JavaScript Window Screen?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
___.getElementById("demo").innerHTML = "Screen Width: " + screen.width;Put the learning moves in the order that makes the concept easiest to apply.
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
document.getElementById("demo").innerHTML = "Screen Width: " + screen.width;Window Screen Height
The screen.height property returns the height of the visitor's screen in pixels.
Example
document.getElementById("demo").innerHTML = "Screen Height: " + screen.height;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
document.getElementById("demo").innerHTML = "Available Screen Width: " + screen.availWidth;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
document.getElementById("demo").innerHTML = "Available Screen Height: " + screen.availHeight;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
document.getElementById("demo").innerHTML = "Screen Color Depth: " + screen.colorDepth;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
document.getElementById("demo").innerHTML = "Screen Pixel Depth: " + screen.pixelDepth;For modern computers, Color Depth and Pixel Depth are equal.