Curious, I tried playing around with it in Flash.

Trickyness is introduced if it's to behave like another textfield
supporting selecting, backspace, cutting and pasting. Having to modify
the original word via array operations.

Also you need a fixed size font to keep the word from jumping aroudn
match. Meaning you can't replace m and i with a bullet and have them
spaced the same. This might interfere with the graphic design of some
sites, but there are alternative ways to mask. Played with blacking
things out - hard to see select, blur seemed viable.

Also in backspacing I found it preferable to keep the last character
in the word visible over the delay then hide.

Troy.
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