Regarding Detecting Variables in External HTML Objects

vivek Community Member Posts: 12
Is there an example or can someone explain more about how to utilize this feature:

*Detecting Variables in External HTML Objects

Automatically detect user variables inside External HTML objects, which will conveniently be displayed in the Variable Manager and are included when the page is published.

as mentioned here Online e-Learning, e-Learning Collaboration Software, HTML5 Mobile e-Learning | Lectora Online