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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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The localized calender widget is working properly in an Iframe. I tested it on a HTML page using iframe and it shows up just fine, however the form's height will increase if you activate or click the widget.
Can you please share the webpage where the form is embedded so we can take a look. Thank you.