The on-screen keyboard in Windows Phone has received lots of praise for its accuracy and intelligent suggestions and corrections. What's its secret? One of them is the use of a dynamically changing "hit targets" for each of the keys, as demonstrated in this engineering video. As you can see, the area of sensitivity around each key changes on the fly depending on what letter Windows Phone expects next. This helps reduce accidental typos caused when a user's finger covers more than one key (a common occurrence on small smartphone screens).
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