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Width (in pixels) of the browser window viewport including, if rendered, the vertical scrollbar.
nsIDOMWindowUtils.setCSSViewport() to set the virtual window size for page layout purposes, the value returned by this property corresponds to the viewport width set using that method.Syntax
var intViewportWidth = window.innerWidth;
Value
intViewportWidth stores the window.innerWidth property value.
The window.innerWidth property is read only; it has no default value.
Notes
The innerWidth property is supported in any window object like a window, a frame, a frameset, or a secondary window.
There is an algorithm to obtain the width of the viewport excluding, if rendered, the vertical scrollbar.
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;
To change the size of a window, see window.resizeBy and window.resizeTo.
Specification
| Specification | Status | Comment |
|---|---|---|
| CSS Object Model (CSSOM) View Module The definition of 'window.innerWidth' in that specification. |
Working Draft | Initial definition |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 1 | 1.0 (1.7 or earlier)[1] | 9 | 9 | 3 |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | 1 | 1.0 (1.0)[1] | 9 | 9 | 3 |
[1] From Firefox 4 to 24, this property was buggy and could give a wrong value before page load on certain circumstances, see bug 641188.