How to programmatically set the font size to "auto"?

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Hello,

I'd like to implement a PDF form filler that supports text auto-sizing/shrinking. Is there a syntax for natively setting the font size to auto? I've tried: '/Helv 0 Tf'' but get quirky behaviors - the inputted text is there but it doesn't show up in screen. I'm only able to see the text after clicking into the text box in my PDF viewer.

Any advice? Attached is an animated GIF of the behaviors.

Thank you.

Acrobat SDK and JavaScript

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What is "raw ISO language"? Do you mean you are hand coding the PDF?

If so, just use Acrobat to make an Auto field and see what it does.

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Watson27280693vrjdAuthor

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Yes hand-coded. The field is set to auto. What should the DA be set to so it honors the auto-sizing? I've tried font size 0 - the text is there but it does not display on screen.

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