Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

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.


A number that represents the width of the document in pixels.


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

BCD tables only load in the browser

See also