Javascript to adjust form field font size by number of entered characters?

I have a form field that asks for 'full name' (first, middle, last). It's posted large at the top of the form. Some people's names are short, some long.
Is there a javascript way to adjust the font size used within a form field based on the number of characters entered into field?
i.e. if the name entered is Joe Smith, the font size is 30pt, if it's Alexander Hamilton the font size is 20pt?
Thanks!

Uhm... because I never noticed that option before! hehe. Jeez.
Gilad, thx much. That's exactly what I was looking to accomplish.
(An aside: trying to find a specific Adobe solution or function isn't very easy. I always search the forums, the documentation, and Google before posting any question here. Seems like there are so many features in every product that change so frequently that finding even a simple answer is a challenge...)

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Javascript to adjust form field font size by number of entered characters?

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