How to jump to the search box
You can jump to the search box from anywhere on a page, which is especially useful on long articles, so you don't have to scroll up to get to it. To do this, press Alt-F (this works on most Windows systems). For a search box in which the cursor is already focused, use www.wikipedia.org. You can place this link on your browser's toolbar so that you always have immediate access to it.
Read more: Why this doesn't happen automatically
See also: Wikipedia:Keyboard shortcuts