moved-nested-layoutsubtree-canvas.tentative.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/manual/draw-element-image/moved-nested-layoutsubtree-canvas.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>drawElementImage should throw if a canvas is moved to be nested inside another canvas</title>

<link rel="help" href="https://github.com/WICG/html-in-canvas">

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

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

<script src="/html/canvas/resources/wait-for-canvas-paint.js"></script>

<canvas id="canvas_a" layoutsubtree="true" width="100" height="100">

  <div id="div" style="width: 100px; height: 100px;"></div>

</canvas>

<canvas id="canvas_b" layoutsubtree="true" width="100" height="100">

</canvas>

<script>

promise_test(async (t) => {

  await waitForCanvasPaint(canvas_a);

  const ctxA = canvas_a.getContext('2d');

  // Initial draw should succeed.

  ctxA.drawElementImage(div, 0, 0, 100, 100);

  canvas_b.appendChild(canvas_a);

  await waitForCanvasPaint(canvas_b);

  // Now it is nested, so it should throw.

  assert_throws_dom("NotSupportedError", () => {

    ctxA.drawElementImage(div, 0, 0, 100, 100);

});

}, "drawElementImage should throw if a canvas is moved to be nested");

</script>