The read-only Window property innerWidth returns the interior width of the window in pixels. This includes the width of the vertical scroll bar, if one is present.
More precisely, innerWidth returns the width of the window's layout viewport. The interior height of the window—the height of the layout viewport—can be obtained from the innerHeight property.
Syntax
let intViewportWidth = window.innerWidth;
Value
An integer value indicating the width of the window's layout viewport in pixels. This property is read-only, and has no default value.
To change the window's width, use one of the Window methods for resizing windows, such as resizeBy() or resizeTo().
Usage notes
If you need to obtain the width of the window minus the scrollbar and borders, use the root <html> element's clientWidth property instead.
The innerWidth property is available on any window or object that behaves like a window, such as a frame or tab.
Example
// This will return the width of the viewport var intFrameWidth = window.innerWidth; // This will return the width of the frame viewport within a frameset var intFrameWidth = self.innerWidth; // This will return the width of the viewport of the closest frameset var intFramesetWidth = parent.innerWidth; // This will return the width of the viewport of the outermost frameset var intOuterFramesetWidth = top.innerWidth;
Specification
| Specification | Status | Comment |
|---|---|---|
| CSS Object Model (CSSOM) View Module The definition of 'window.innerWidth' in that specification. |
Working Draft | Initial definition |
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
innerWidth | Chrome Full support 1 | Edge Full support 12 | Firefox
Full support
1
| IE Full support 9 | Opera Full support 9 | Safari Full support 3 | WebView Android Full support 1 | Chrome Android Full support 18 | Firefox Android
Full support
4
| Opera Android Full support 10.1 | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 |
Legend
- Full support
- Full support
- See implementation notes.
- See implementation notes.