fcp-canvas-context.html

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This WPT test may be referenced by the following Test IDs:
- /paint-timing/fcp-only/fcp-canvas-context.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<head>

<title>Performance Paint Timing Test: FCP when canvas context is created</title>

</head>

<body>

<script src="../resources/utils.js"></script>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<canvas id="canvas" width="50" height="50"></canvas>

<script>

  setup({"hide_test_state": true});

  promise_test(async t => {

    assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported.");

    await new Promise(r => window.addEventListener('load', r));

    await assertNoFirstContentfulPaint(t);

    const canvas = document.getElementById('canvas');

    const context = canvas.getContext('2d');

    context.fillRect(0, 0, 100, 100);

    await assertFirstContentfulPaint(t);

  }, 'Canvas should count as contentful when context is created');

</script>

</body>

</html>