Capture Entry Point to a Contact Form

Is it possible to capture the URL the user was on when the link to a Contact Form was clicked, e.g., history.back()? I want to place the link in multiple places, but would also like to capture where the user came from.

I thought I might be able to add (and hide) a field called Back and then use custom CSS to load that field with the location.

 

I found the following info from DiviEngine.com: https://diviengine.com/how-to-add-the-page-name-and-url-to-the-confirmation-email-in-divi/. This definitely explains how to do what I want, but requires the creation of a child theme and adding Jquery to it. I have the Divi part worked out, but now have to create the child theme.