Does it return "yes" in this case?

Action “only when” checkbox is visible.

If the parent group of the checkbox is not visible (and the checkbox is hidden only because its parent group is hidden, but the element itself is visible technically) does it return “yes” or no"?

I had to read that about 5 times for my brain to soak it in! … but regardless of the checkbox being hidden or visible, if it’s in a group and that group is hidden then the condition will validate as false.

The thing to remember here is that the group (whether it be displayed or hidden) will be applied to everything in it, so to speak. So for example, if you have 5 checkboxes in a group and they’re all set to “this element is visible on page load” BUT your group is hidden, then that Action condition will validate as FALSE because everything inside it will also be hidden.

Does that help?

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Thanks, does this imply also that having a heavy group (containing lots of elements) not visible on page load - but the elements within ARE set to be visible on page load - translates into saving page loading time, as if those elements within were hidden on page load?

Yep, pretty much. None of those elements inside the containing group will be visible if the group itself is set to not visible.