UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36

Steps to reproduce the problem:
1. https://jsfiddle.net/w0s4xmc0/54570/ open in Chrome
2. Drag and drop rectangle on bottom ones
3. Drag events only work on elements not above the iframe

What is the expected behavior?
If a solid pointer-events-consuming element is between the cursor and the cross-origin iframe, drag events are expected to be received as usual.

What went wrong?
Drag events will not be fired when cursor is above a cross-origin frame.

The event behavior only works as expected if the in-between glasspane is solid and non-transparent. As soon as one single pixel of the frame is visible, the drag events stop working.

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 70.0.3538.110  Channel: stable
OS Version: 10.0
Flash Version: 

The drag events works fine in the following browsers:
- IE 11.726.16299.0
- Edge 41.16299.726.0
- Firefox 63.0.3
- Vivali 2.1.1337.47, Chrome/70.0.3538.103