This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Window.outerWidth read-only property returns the width of the outside of the browser window. It represents the width of the whole browser window including sidebar (if expanded), window chrome and window resizing borders/handles.
To change the size of a window, see window.resizeBy() and window.resizeTo().
To get the inner width of a window, i.e., the width of the page being displayed, see window.innerWidth.
| Specification |
|---|
| CSSOM View Module> # dom-window-outerwidth> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
outerWidth |
1 | 12 | 1 | 9 | 3 | 18 | 4 | 10.1 | 3 | 1.0 | 4.4 | 3 |
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https://developer.mozilla.org/en-US/docs/Web/API/Window/outerWidth