Measuring the window offset

Is there a way to measure the offset of the window in jQuery, in order than I might compare the positions of a 'fixed' element and a relatively positioned one?

I need to be able to tell how far the window is scrolled so I can use the figure to calculate the difference between the height of the f开发者_C百科ixed element (which is relative to the viewport top) and the relative object (which is relative to the top of the document)

$(window).scrollTop() and $(window).scrollLeft() can be used to find scroll positions.

Using plain Javascript without jQuery should be window.pageXOffset and window.pageYOffset, which return the number of pixels offset by scrolling.

Source: https://developer.mozilla.org/en-US/docs/Web/API/Window/scrollY

document.body.offsetWidth;

and

document.body.offsetHeight;

By using these javascript functions you can get actual width and height of the browser window