This plugin allows for a 3rd height, width and top margin setting of an element. Now you can calculate the height of the target element by setting it's height to be 100% of the viewport +/- some pixel value. Alternatively you can create a calculation using 5 values to determine the desired height, width or top margin of an element.
Great for when you need to set an element height to fill the screen while taking into account floating headers or bottom navigation bars.

This plugin also enables Single Page Apps to be viewed beautifully on mobile browsers. Using the element Mobile Page Height the element will expose the value of the page height, while taking into consideration the visibility of the web browser address bar, and locks the page height and removes ability of page refresh on scroll up. This solves a lot of headaches for Single Page App design and the irritating reloading of the page if the web user scrolls up beyond the top of the page.