toBlob-cross-realm-callback-report-exception.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/semantics/embedded-content/the-canvas-element/toBlob-cross-realm-callback-report-exception.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>toBlob() reports the exception from its callback in the callback's global object</title>

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

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

<iframe srcdoc="<canvas></canvas>"></iframe>

<iframe></iframe>

<iframe></iframe>

<script>

setup({ allow_uncaught_exception: true });

const onerrorCalls = [];

window.onerror = () => { onerrorCalls.push("top"); };

frames[0].onerror = () => { onerrorCalls.push("frame0"); };

frames[1].onerror = () => { onerrorCalls.push("frame1"); };

frames[2].onerror = () => { onerrorCalls.push("frame2"); };

async_test(t => {

  window.onload = t.step_func(() => {

    const canvas = frames[0].document.querySelector("canvas");

    canvas.toBlob(new frames[1].Function(`throw new parent.frames[2].Error("PASS");`));

    t.step_timeout(() => {

      assert_array_equals(onerrorCalls, ["frame1"]);

      t.done();

    }, 25);

});

});

</script>