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Character Countdown in VWF textarea field

Anyone know if it's possible to add a character counter (count down) to a Visual Workflow text area field?  We have a number of audit flows into which users tend to get carried away typing things....only to be told upon submit that their missive is a bit too long (e.g., we have a validation rule set to warn on character overflow).


But we'd like to take that one step further and clue them as they approach the limit.



If you want a no coding approach, the validation rule on the input field using the LEN would be the easiest way to go.
If you want something akin to "300 characters remaining" which countsdown, you may have to resolve to JS