Chrome Version: 65.0.3325.18 (Official Build) Revision8537a0b30e659eefb087ec25b97a1a7f61e2d672-refs/branch-heads/3325@{#78}(64-bit)
OS: Mac(10.12.6,10.13.1,10.13.3)
URL : https://chrome.google.com/webstore/detail/spelunky-html5/mhagnkphcmpkmabhocgimoncfaihkpof/related 

What steps will reproduce the problem?
(1) Launch chrome, navigate to above url and install game
(2) Now launch app and click to open game in Full screen mode and then press 'Esc' key to exit full screen mode,observe

Actual: Rendering is not proper when switched to or exit from Full screen mode 
Expected: Rendering should be proper when switched to or exit from Full screen mode

This is a Non-regression issue seen from M60 series(build # 60.0.3072.0) 

Note: 
1. Issue is also seen on Stable/Beta M-64 (build #64.0.3282.119),Dev(build #65.0.3322.3) and M-66 canary (build #66.0.3330.0)
2. Issue is not seen on Windows (7,8,8.1,10),Linux (14.04 LTS) OS.
 

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