Ctrl+F

Pressing Ctrl+F opens the Find field, which allows you to search the text currently displayed in any program that supports it. For example, Ctrl+F can be used in your Internet browser to find text on the current page. Press Ctrl+F now to open the Find in your browser and search for "shortcut" to display each time shortcut is mentioned on this page.
On Apple computers, use Cmd + F to find.