How to add your own js code to the Bitrix24 cloud interface?

Question

API

I embed the application in B24 (cloud) - everything is ok.
I can display everything that is needed in the frame.
But when I embed the script tag, the code is not executed. Mb how it is shielded or something else, but I'm obviously going in the wrong direction.
At the same time, I know that widgets work to change the Bitrix interface (they are in the catalog), so this is possible :)

Please advise in which direction to move so that I can manipulate DOM elements in the card in CRM

Answer 1

All embedding occurs exclusively in the included iframe.
In this area, you can do almost anything, but you cannot go beyond the area (from the field to the CRM card).
Those. change the transaction card - you can not