Some blogs and webpages have obnoxiously long pages that go on forever... and that's where this widget comes in handy. As you can see, there is a small floating arrow at the bottom-right of this page. It always maintains the same position. Scroll down a little, then if you click on it, it will take you to the very top of the page.
Why it's a good thing?
Source from Installing Google Translate Widget (2)

The html code: