gecko-dev/gfx/webrender/tests/bug_servo_10164.html

<style>
  .red {
    width: 200px;
    height: 200px;
    overflow: hidden;
    transform: scale(0.5);
    background: red;
  }
  .green {
    height: 100px;
    width: 200px;
    transform: translateX(-100px);
    background-color: green;
  }
</style>

<div class="red">
  <div class="green"></div>
</div>