chromium/third_party/blink/web_tests/compositing/squashing/subpixel-rounding.html

<!doctype HTML>

<!-- The second div squashes into the first, and had a fractional position greater than 0.5. This tests that pixel snapping for squashed layers
     matches that of non-squashed layers -->
<div style="position: absolute; width: 200px; height: 200px; left: 0px; top: 0px; will-change: transform; background-color: lightgreen"></div>
<div style="position: absolute; width: 1px; height: 1px; left: 0px; top:0.6px; background-color: lightgray"></div>