chromium/src/third_party/blink/web_tests/fast/canvas/canvas-filter-units-em-liveness-expected.html

<canvas id="canvas" width="100" height="100"></canvas>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.fillStyle = 'green';
ctx.fillRect(25, 25, 25, 50);
ctx.fillRect(60, 25, 25, 50);
</script>