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It also doesn't work in the Windows default browser, but I think that's an Edge case.

It's broken on my 2014 MacBook Air with Safari 11.1.1. Works OK on Firefox and Chrome.

I don't see any problems with Safari 11.1.1 on macOSX or on mobile Safari on my iPhone.

Right. It works on my 2013 MacBookPro, but the drawing looks incomplete/broken on my 2015 Retina 5k iMac. Both run macOS 10.13.5.

all examples work for safari 11.0.3