Positioning Elements on a Web Page. Chapter 13. How Positioning Properties Work. Absolute: Lets you determine an element’s location by specifying a Left Right Top Bottom In pixels, ems , or percentages They are completely detached from the flow of the page.
top: 50px; HTML flow
Technically, you can specify both left and right position properties and let the browser determine the width of the element.
Unfortunately, IE 6 or older will not get this right. It recognizes the left, but ignores the top, right, and bottom.
Width and Height positioning doe exactly the same thing.