If you’re familiar with programming and doing a code-difference on the changes you’ve made to your code, you’ll probably notice some similarities to this web-based tool. This tool basically shows the difference between two sets of data and allows you to copy one set of data to the other. There’s more to it, but let’s not bore you too much.
And oh! If you resize your browser, the web app will resize itself to use the most space as possible… because I just hate white empty space.