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chromium/third_party/blink/web_tests/external/wpt/css/css-paint-api/geometry-border-image-002-ref.html 

<!DOCTYPE html>
<html>
<style>
html, body { margin: 0; padding: 0; }
</style>
<body>
<canvas id ="canvas" width="90" height="90" style="position:relative; left:-20px; top:-20px"></canvas>
<script>
var canvas = document.getElementById('canvas');
var context = canvas.getContext("2d");
context.fillStyle = 'green';
context.fillRect(0, 0, 90, 90);
</script>
</body>
</html>