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chromium/third_party/blink/web_tests/fast/canvas/fillrect-gradient-zero-stops.html 

<body>
<p>
The canvas below should show a gradient with zero stops, which according to the specification is filled with transparant black, ie. not visible. This tests <a href="http://bugs.webkit.org/show_bug.cgi?id=13784">Bug 13784, REGRESSION (r13744-13750): Crash with empty gradient when drawing to canvas</a></p>
<canvas id="c"></canvas>
<script>
window.onload = function () {
  var ctx = document.getElementById('c').getContext('2d');
  ctx.fillStyle = ctx.createLinearGradient(0, 0, 0, 50);
  ctx.fillRect(0, 0, 300, 150);
};
</script>
</body>