Usage:
Use the shortcode [pardot_iframe src="" height="" mobile-height=""]
As a shortcode that accepts a src paramter, pass UTMs to Pardot when using the Pardot iFrame implementation. From the pardot generated iframe code, take the src attribute, and copy it into the src attribute of the shortcode. Include a height attribute in the shortcode to specify a desktop height other than the default 800px. Include a height attribute in the shortcode to specify a Mobile height other than the default 800px.