In forums or similar things where I have a text box that is filled up and it has a scroll bar on the side, when I click and hold, then move my cursor a pixel, Safari zip-scrolls down to the bottom of the page. This does not happen in text boxes that are not filled up and don't have a scroll bar, but when you type and fill up the text box so that it has a scroll bar, this problem usually happens, though occasionally this problem does not happen.
Here is a video
Here is a video