UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36

Steps to reproduce the problem:
With this new option it should:

1. Enable stacking context for that element internally so it's on a separate layer;
2. Use that layer as a screenshot output including transparency.

What is the expected behavior?

What went wrong?
Right now capture node screenshot only captures some rectangle portion of the viewport and doesn't take transparency into consideration. This will be extremely useful for elements that have box-shadow, opacity or any other semi-transparent effects.

Did this work before? N/A 

Chrome version: 62.0.3202.89  Channel: stable
OS Version: 10.0
Flash Version: