Values of 'pixelated' or 'crisp-edges' should affect the rendering of scaled canvases. This has worked in Chrome and Firefox for years now.
For a quick test, doodle something in my Game of Life app. You will immediately see the problem:
I would greatly appreciate a fix for this. I was hoping Safari 10 would solve this bug. Thanks.
Note that the problem is specific to canvases that have been scaled up with CSS transforms. (With explicit css dimensions and no transforms, the rendering is correct, as expected.)
This is really just bug 27684.