Along with WebKit hardware-accelerated anti-aliasing, CSS 3D transforms can have adverse affects on type rendering when translate X/Y values have subpixel, or decimal values.

View fiddle: Subpixel type rendering. Hover over elements to disable transforms.

In WebKit, the first two elements will have fuzzy type and borders, as rendered elements don’t exactly line up with pixels on the screen.

Just to be thorough, I took a look at 2D subpixel translation transforms (i.e. translateX(0.5px)). In WebKit, the type seems to render appropriately with the subpixel values. However the borders don’t look so good. They get positioned in between pixel spaces, rendering a 1px border with 2 pixels. Firefox doesn’t have any issues with borders.

The fix is to prevent decimal values when using translate and round those values to the nearest integer.