How to freeze the browser (F8 doesn't help)?

Question

JavaScript

There is a combobox type element (combobox) and I need to study its markup and styles. But in DevTools, this element cannot be caught, because this list disappears from the DOM on the blur event.
Tried to freeze with F8 (pause JavaScript in chrome). But blur occurs before pressing F8.
How to freeze the browser in this case?

Answer 1

The break on subtree modification tool from the context menu on the element helped, where it is supposed to catch the appearance of the drop-down list.

Answer 2

force state -> :focus doesn't help?