combining SHIFT with other keys often inverts their function (by design). Space bar will scroll down the page of most web browsers. SHIFT+spacebar will scroll

combining SHIFT with other keys often inverts their function (by design). Space bar will scroll down the page of most web browsers. SHIFT+spacebar will scroll up. Tab will move to a new element on a web form. SHIFT+tab will move "backward" to the previous element in the form.