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Need to change the iframe tag which display the data which comes from another page is need to change into div for accessibility issue.
An iFrame is meant to embed a different page within a page; you can't use it to contain a single form field within a set of form fields, assistive technology will interpret that as a separate document, which is obviously not semantically correct. You need to find a different way to do whatever it is you are trying to do. Remove the iFrame, put the form field into the main page and associate it with a standard HTML label element.