ok great, if the fields are repeated then will the rwmb_begin_html duplicate the html?
I am basically trying to prefix some html before every repeatable group field, is there a way to also know which numbered clone it is targeting? e.g. clone group 1
The begin HTML is not duplicated, the field wrapper will be duplicated. You can use the Inspect tool of the browser to check the HTML structure, screenshot https://imgur.com/LvoxdxO
I'm not sure if there is a way to also know which numbered clone it is targeting, you can try to use the JS code and append your prefix HTML.