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Test Info:

<!DOCTYPE html>
<canvas id="canvas"></canvas>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></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");