toBlob-origin-clean-offscreen.sub.html

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This WPT test may be referenced by the following Test IDs:
- /imagebitmap-renderingcontext/toBlob-origin-clean-offscreen.sub.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<title>convertToBlob, OffscreenCanvas: origin-clean flag</title>

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

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

<link rel="help" href="https://html.spec.whatwg.org/multipage/scripting.html#the-imagebitmap-rendering-context">

<script>

const crossOriginImageUrl = "http://{{domains[www1]}}:{{ports[http][0]}}/images/red.png";

async_test(t => {

  var img = new Image();

  // Use a cross-origin URL.

  img.src = crossOriginImageUrl;

  img.onload = t.step_func(e => {

    createImageBitmap(img, 0, 0, img.width, img.height)

    .then(t.step_func(bitmap => {

      var canvasBitmap = new OffscreenCanvas(img.width,img.height);

      var contextBitmap = canvasBitmap.getContext("bitmaprenderer");

      contextBitmap.transferFromImageBitmap(bitmap);

      promise_rejects_dom(t, 'SecurityError',

        canvasBitmap.convertToBlob(),

        "convertToBlob on a tainted OffscreenCanvas has to throw").then(t.step_func_done());

    }));

});

}, "Test that call convertToBlob on a tainted OffscreenCanvas throws exception");

</script>