The scrollheight/scrolltop/clientheight of Document.documentelement and Document.body under Ie/ff/chrome

DTD has been declared
Ie
Document.documentElement.scrollHeight Browser All content height, document.body.scrollHeight browser all content height
Document.documentElement.scrollTop Browser Scroll section height, Document.body.scrollTop always 0
Document.documentElement.clientHeight Browser viewable section height, document.body.clientHeight browser all content height

Ff
Document.documentElement.scrollHeight Browser All content height, document.body.scrollHeight browser all content height
Document.documentElement.scrollTop Browser Scroll section height, Document.body.scrollTop always 0
Document.documentElement.clientHeight Browser viewable section height, document.body.clientHeight browser all content height

Chrome
Document.documentElement.scrollHeight Browser All content height, document.body.scrollHeight browser all content height
Document.documentElement.scrollTop always scrolls part height for 0,document.body.scrolltop browser
Document.documentElement.clientHeight Browser viewable section height, document.body.clientHeight browser all content height

DTD not declared
Ie
Document.documentElement.scrollHeight Browser viewable section height, document.body.scrollHeight browser all content height
Document.documentElement.scrollTop always scrolls part height for 0,document.body.scrolltop browser
Document.documentElement.clientHeight always viewable part height for 0,document.body.clientheight browser

Ff
Document.documentElement.scrollHeight Browser viewable section height, document.body.scrollHeight browser all content height
Document.documentElement.scrollTop always scrolls part height for 0,document.body.scrolltop browser
Document.documentElement.clientHeight Browser All content height, document.body.clientHeight browser viewable part height

Chrome
Document.documentElement.scrollHeight Browser viewable section height, document.body.scrollHeight browser all content height
Document.documentElement.scrollTop always scrolls part height for 0,document.body.scrolltop browser
Document.documentElement.clientHeight Browser All content height, document.body.clientHeight browser viewable part height

Browser All content height that is the height of the entire frame of the browser, including the scroll strip volume go to part + visible part + bottom hidden section height sum

The browser scrolls the height of the scroll bar, which is the height of the top of the entire object, depending on the height.

In comprehensive

1, Document.documentElement.scrollTop and Document.body.scrollTop always have a 0, so you can use these two and to seek scrolltop

2, ScrollHeight, clientheight in the case of a DTD has been declared with the documentelement, not declared the case with the body

Document.compatmode can be used to determine if a DTD is declared with a value of "Backcompat": not declared with a value of "Css1compat"

The scrollheight/scrolltop/clientheight of Document.documentelement and Document.body under Ie/ff/chrome