UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Safari/604.1.38

Steps to reproduce the problem:
1. Open http://output.jsbin.com/gahorow (or attached repro case).

What is the expected behavior?
Image with tree transparent black quarters and one — opaque black.

What went wrong?
Junky image.

Did this work before? N/A 

Does this work in other browsers? No
 WebKit: https://bugs.webkit.org/show_bug.cgi?id=177929
FF: https://bugzilla.mozilla.org/show_bug.cgi?id=1406015

Chrome version: 61.0.3163.100 (Official Build) (64-bit)  Channel: n/a
OS Version: OS X 10.12.6
Flash Version: 

Doesn't seem to reproduce in Canary.
 

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jsbin.gahorow.3.html 2.3 KB View Download

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	Screen Shot 2017-10-05 at 14.11.43.png 48.6 KB View Download