Simple example: http://jsfiddle.net/greggman/mn9ebgkL/ This is not about scaling with a transform and given that a canvas with a 2D context works where as a canvas with WebGL fails it seems like a different bug than https://bugs.webkit.org/show_bug.cgi?id=162592
Works in Chrome, doesn't work in Firefox.
<rdar://problem/47656086>