T he actual height left for the webpage will vary, depending on which menus, buttons, etc. O n the contrary, if all toolbars are activated the page gets full window size less 186 pixels. A s you can see, the visual height of the web page is an elastic measurement. In either case, the number of pixels used by toolbars, etc. is 186.
T herefore it is hard to make a fixed design with respect to the visual height.
The result simply varies - not only from users with different screen resolutions but also from users with the same resolutions but different browser setups. T his means that the width of the screen only varies with the resolution, while the height also varies with the customization of the browser. T his means that the navigation structure of the page should be kept at the upper 300 pixels of the page.