The reason behind this request is sometimes I scroll down the questions to see the available questions that I can answer, when the scroll bar already on the bottom page I want to refresh the page to find the newest questions. When the whole page already load, the page will display on the latest state (in this case my scroll bar on the bottom page). So when I want to go to top page I must scroll back to the top, maybe if this possible added some button in the right corner like in 9gag.
If you are at a PC, then press home and you will magically be back to the top of the page. Not sure we need to duplicate browser functionality.
Equally, using space or shift+space to scroll up/down may save you some time - again, standard browser shortcuts (nothing to do with stackoverflow).
If you want the refresh to scroll to the top, use the keyboard shortcuts in Marc's answer.
If you want the button to scroll to the top so that you can see the top again, for whatever reason, why not scroll manually? Just click the scrollbar and drag it to the top--it takes about a second.
9gag has infinite scrolling, which is why that button is implemented. We've got a relatively tiny page--just scroll to the top normally.
I have no official say, but I really want to post this pic somewhere:
(That's Nick Craver, SE dev)
Anyway, that's what I think will happen here ;-)