blob-url-creation.html

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<!DOCTYPE html>

<meta charset="utf-8">

<body>

  <script>

    'use strict';

    // Create a blob and get its URL.

    const blob = new Blob(["TEST"], { type: "text/plain" });

    const blob_url = URL.createObjectURL(blob);

    // Send the blob URL back to the opener.

    window.parent.postMessage({ type: "blobURL", message: blob_url }, "*");

  </script>

</body>