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This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

Note: Starting in Gecko 6.0, document.width is no longer supported. Instead, use document.body.clientWidth. See element.clientWidth.

Returns the width of the <body> element of the current document in pixels.

Not supported by Internet Explorer.


pixels = document.width;


function init() {
  alert("The width of the document is " + document.width + " pixels.");


document.body.clientWidth              /* width of <body> */
document.documentElement.clientWidth   /* width of <html> */
window.innerWidth                      /* window's width */



Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Chrome No support NoEdge ? Firefox No support NoIE ? Opera ? Safari ? WebView Android No support NoChrome Android No support NoFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android ?


No support  
No support
Compatibility unknown  
Compatibility unknown
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.

See also