testing/web-platform/tests/mixed-content/resources/blob-popup.html


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<!DOCTYPE html>
<meta charset="utf-8">
<script>
  opener.postMessage({
      potentially_trustworthy: location.protocol === "https:",
      js_blob_url: URL.createObjectURL(
          new Blob([`const message = "Hello World!"`],
                   {type: 'application/javascript'})),
  }, "*");
</script>