chromium/src/third_party/blink/web_tests/fast/canvas/arc360.html

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<canvas id="mycanvas" width="400" height="400"></canvas>
<script>
test(function(t) {
    var canvas = document.getElementById('mycanvas');
    var ctx = canvas.getContext('2d');
    var cx = 200, cy = 200, radius = 100;
    ctx.lineWidth = 10;
    ctx.beginPath();
    ctx.moveTo(0, 100);
    ctx.arc(cx, cy, radius, -Math.PI, Math.PI, false);
    ctx.lineTo(0, 300);
    ctx.stroke();
}, 'Test canvas arc() start / end points when the arc is >= 360 degrees. The result should be a circle with two line segments connected to the left hand side, towards the top left and bottom left corners.');
</script>