Obsolete
This feature is obsolete.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.height is no longer supported. Instead use document.body.clientHeight. See element.clientHeight.
Summary
Returns the height of the document object. In most cases, this is equal to the <body> element of the current document.
Syntax
height_value = document.height
Example
// alert document height alert(document.height);
Alternatives
document.body.clientHeight document.documentElement.clientHeight document.documentElement.scrollHeight
Specification
HTML5