HTMLCanvasElement-getImageData-noframe.html

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This WPT test may be referenced by the following Test IDs:
- /mediacapture-fromelement/HTMLCanvasElement-getImageData-noframe.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<body>

<canvas id="canvas"></canvas>

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

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

<script>

promise_test(async t => {

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

  const ctx = canvas.getContext("2d");

  const stream = canvas.captureStream();

  t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));

  const video = document.createElement("video");

  video.srcObject = stream;

  ctx.getImageData(0, 0, canvas.width, canvas.height);

  assert_equals(video.readyState, video.HAVE_NOTHING,

    "Video element was just created");

  // Wait a bit so the video element can update readyState in case of a frame.

  await new Promise(r => t.step_timeout(r, 100));

  assert_equals(video.readyState, video.HAVE_NOTHING,

    "Video element did not get a frame from the canvas");

}, "CanvasRenderingContext2D.getImageData() does not lead to a frame being captured");

</script>

</body>

</html>