Forms HTML5 input attributes
I have a site in development with several forms that can appear in various combinations on multiple pages (some in modal dialogues so require Ajax handling). Perch Forms changes the ID of forms with a prefix (eg form1_) added to the form ID. This means that a particular form can appear on one page as #form1_newsletter and on another as #form2_newsletter.
I have tried using the HTML5 input attribute form="ID reference" on the submit button so that it is easy to target the form being submitted but it just gets stripped.
Am I missing something or is this expected behavior?