Custom attributes add attributes to the <form> HTML tag. Using it requires a bit of technical knowledge. Most users will never need this; it is just used rarely.

Adding custom attributes to forms

Go to the add/edit form, And do as given in the screenshot below:

Add key-value as given below:

Adding custom attributes to form input fields:

1. Click on any input fields in the add/edit form screen.
2. Click on Element configuration.
3. There, you’ll find the “Add custom attribute” button.