How to make a specific 'submit' button the default?

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I have a page/form with several text boxes and several submit buttons.
I would like to have a script that would set one of the buttons as the
'default' when the text in any of several specific text boxes is
changed by the user. 'Default' meaning that's the one that will react
when the user hits the <Enter> key.

I read a message on another board that setting a submit button as the
default is not possible - is that true?

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