A mask format the output of a data. For example, the format of a date is MM/DD/YYYY. In the textbox, you see " / / ". When you enter the date, you don't enter the caracters "/". After that you enter the month, the cursor go the first caracter of the day. After that you enter the day, the cursor go the first caracter of the year.
Well, you would write a javascript function that would probably be called onKeyUp for that box that would read, parse, and reformat the string each time it was/is typed in. There's not a quick and easy way to do it, like there is for other Windows programs or anything. :-(
However, you might very well be able to find a widget for that somewhere at a site like
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