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chromium/third_party/blink/web_tests/paint/subpixel/transform-inside-clip.html 

<!doctype HTML>
<!-- Passes if you see a 1px black border with blue contents -->
<div style="width: 100px; height: 100px; left: 0.5px; will-change: opacity; position: relative;">
  <div style="width: 50px; height: 50px; border: 1px solid gray; left: 0.5px; position: relative; overflow: hidden">
    <div style="width: 200px; height: 200px; transform: scale(1); background: lightblue"></div>
  </div>
</div>