Reproduction steps: (1) Open https://glitch.com/edit/#!/equatorial-caramel-coaster?path=index.html%3A4%3A1 (2) See empty canvas. The same code produces visuals in Chrome and FF (although they have issues of their own).
<rdar://problem/81210289>
This is a dup. We found text sizes to integral values to increase cache hit rates.
*round
*** This bug has been marked as a duplicate of bug 46987 ***