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chromium/third_party/blink/web_tests/fast/canvas/canvas-closePath-single-point.html 

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<body>
<script>
test(function(t) {
    var ctx = document.createElement('canvas').getContext('2d');
    
    document.body.appendChild(ctx.canvas);
    
    ctx.strokeStyle = '#f00';
    ctx.lineWidth = 20;
    
    ctx.fillStyle = '#0f0';
    ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
    
    ctx.beginPath();
    ctx.moveTo(10, 10);
    ctx.lineTo(100, 100);
    ctx.closePath();
    ctx.stroke();
    
    var imageData = ctx.getImageData(0, 0, 1, 1);
    var imgdata = imageData.data;
    assert_equals(imgdata[0], 0);
    assert_equals(imgdata[1], 255);
    assert_equals(imgdata[2], 0);
    assert_equals(imgdata[3], 255);
}, "Test the behavior of closePath on a path with a single point");
</script>
</body>