Conditional Web Form Formatting

I am aware that limiting characters in a form (text) field does not exist. Is it possible to apply a conditional formatting rule to a text field in a form that alerts the submitter that they have reached a specific character count (in the field) prior to submitting the form?

For example: When character count is greater than 100 characters, change text to red while the submitter is typing.

Thank you, Rudy

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