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chromium/third_party/blink/perf_tests/paint/background-in-multicol.html 

<!DOCTYPE html>
<script src="../resources/runner.js"></script>
<script src="resources/paint.js"></script>
<div id="container" style="columns:10; column-gap:0; width:1px; column-fill:auto; height:100px;">
  <div id="child" style="height:1000000px;"></div>
</div>
<script>
  // Measure performance of painting a fragmented block with a background
  // gradient.

  var yellowfirst = false;

measurePaint({
  run: function() {
    child.style.background = yellowfirst ? "linear-gradient(yellow, hotpink)" : "linear-gradient(hotpink, yellow)";
    yellowfirst = !yellowfirst;
  },
});
</script>