Thanks @Andy_Vaughan - I managed to get the code to run by changing the button type to URL and having no URL. Rather cludgy. Yes I gave the button a matching ID. Now I need to get the javascript to do what I wanted - to call the mailclient - the code above creates a new html page with the email link. Looks like its obfiscating the email address from spambots, but really I’d prefer webflow just puts a tickbox next to any entered email addresses - tick to hide this email address from spambots