Content - fb0e75287531ea019c1f986d46481d1616efa993 - 5991327/paint-timing/first-paint-only.html

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Tip revision: 341f3f54b111a7dcb76c7f08bc8982634a29fb8b authored by xlai on 19 March 2018, 15:32:35 UTC
Improve wpt testing on OffscreenCanvas convertToBlob

Tip revision: 341f3f5

first-paint-only.html

<!DOCTYPE html>
<head>
<title>Performance Paint Timing Test: FP only</title>
</head>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="main"></div>

<script>
async_test(function (t) {
    const div = document.createElement("div");
    div.style.width = "100px";
    div.style.height = "100px";
    div.style.backgroundColor = "red";
    div.style.color = "blue";
    document.getElementById("main").appendChild(div);

    function testPaintEntries() {
        const bufferedEntries = performance.getEntriesByType('paint');
        if (bufferedEntries.length < 1) {
          t.step_timeout(function() {
            testPaintEntries();
          }, 20);
          return;
        }
        t.step(function() {
            assert_equals(bufferedEntries.length, 1, "FP only.");
            assert_equals(bufferedEntries[0].entryType, "paint");
            assert_equals(bufferedEntries[0].name, "first-paint");
            t.done();
        });
    }
    t.step(function() {
      testPaintEntries();
    })
}, "Performance first paint timing entry exists. No first contentful paint.");
</script>
</body>
</html>

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