<!DOCTYPE html>
<head>
<title>Performance Paint Timing Test: FCP due to canvas</title>
</head>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<canvas id="canvas" width="200" height="200" ></canvas>

<script>
setup({"hide_test_state": true});
async_test(function (t) {
    assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported.");
    const canvas = document.getElementById("canvas");
    const context = canvas.getContext("2d");
    context.beginPath();
    context.moveTo(0,0);
    context.lineTo(300,150);
    context.stroke();
    function testPaintEntries() {
        const bufferedEntries = performance.getEntriesByType('paint');
        if (bufferedEntries.length < 2) {
            t.step_timeout(function() {
                testPaintEntries();
            }, 20);
            return;
        }
        t.step(function() {
            assert_equals(bufferedEntries.length, 2, "There should be two paint timing instances.");
            assert_equals(bufferedEntries[0].entryType, "paint");
            assert_equals(bufferedEntries[0].name, "first-paint");
            assert_equals(bufferedEntries[1].entryType, "paint");
            assert_equals(bufferedEntries[1].name, "first-contentful-paint");
            t.done();
        });
    };
    t.step(function() {
        testPaintEntries();
    });
}, "First contentful paint fires due to canvas render.");
</script>
</body>
</html>
