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How to make the form length to adjust automatically using iframe?Asked by staffordfields on October 06, 2015 at 03:16 PM4. Length of form. I purchased a form for Contacts which has an Envelope which auto appends to whatever length the form requires. This works SUPER well. My question is this.... What code for insertioin into iframe makes the form automatically append to the right length? ON my 'Order Form' , I have to set the length pxl to wayyy high to get a mobile screen to see the bottom of the form. Especially since I have some auto-expanding fields on it. The Contact form seems to work great... what did they or can you recommend doing to make that seek that end automatically?