UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.62 Safari/537.36

Steps to reproduce the problem:
1. open any html page where is an element with attribute `draggable="true"` 
2. drag this element to another position
3. you will see the white background while dragging

an example https://www.dropbox.com/s/3p13bjbdx6yzjpg/linux.png?dl=0

You could test it here http://jsfiddle.net/g2k1dcs1/1/

here is a video how it works on linux https://www.dropbox.com/s/gg6nqydlidvu7sp/AwesomeScreenshot-2017-10-27T16-29-07-617Z.webm?dl=0

What is the expected behavior?
I want to see transparent background of dragging element as it happens on chrome on windows and MacOs

something like this https://www.dropbox.com/s/zch9nrj2udqc545/windows.png?dl=0 

What went wrong?
White background appears

Did this work before? N/A 

Chrome version: 61.0.3163.100 (Official Build) (64-bit)  Channel: n/a
OS Version: 10.0
Flash Version: