canvas-invalid-size-change-context-lost.html

<!DOCTYPE html>
<script src="../../resources/js-test.js"></script>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="resources/canvas-context-lost-events.js"></script>
<canvas id="canvas"></canvas>
<script>

async_test(function(t) {
  const canvas = document.getElementById('canvas');
  const ctx = canvas.getContext('2d');

  canvas.oncontextlost = t.step_func(() => {
    contextLost(ctx);

    // The canvas will retry restoring after 500ms, 4 times before giving up.
    // Wait passed this deadline and verify that the context could not be
    // restored.
    t.step_timeout(() => {
      verifyContextLost(true, ctx);
      t.done();
    }, 500 * 5);
  });
  canvas.oncontextrestored = t.step_func(() => {
    assert_true(false, "Context should be restored, it's size is invalid.");
  });

  verifyContextLost(false, ctx);
  canvas.width = 1000000000;
  verifyContextLost(true, ctx);
}, "Test the behavior of disconnected canvas recovery after a gpu context loss");

</script>

chromium/third_party/blink/web_tests/fast/canvas/canvas-invalid-size-change-context-lost.html