Currently for a user to do multiple selection with a <select> control on a web form they must know about the shift and command / control keyboard operations common to OS file managers. This is recall over recognition, and since many user do not know about this behavior a number of web sites include textual descriptions of what to do. To avoid this interface problem, we should add check boxes (styled to look native) to the select control. Interacting with it using keyboard commands like hitting shift to select a range, or control to select individual items, should toggle the check boxes appropriately.
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