Element Custom Attributes
You can add custom attributes to the wrapper of every Section, Column or Widget.
This enables the addition of data-* attributes, ARIA attributes (accessibility) and values, header, footer, sidebar, rel=*, and other attributes that can be found here: https://www.tutorialspoint.com/html5/html5_attributes.htm
Add Custom Attributes to Sections, Columns, or Widgets
Example of one property for one attribute:
Example of two properties for one attribute:
In this example, data-spots is the custom attribute, and round and long are the properties of the attribute. When you view the source code that is output, it will look like this: