file_bug1691153.html

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<!DOCTYPE html>

<html>

<head>

    <meta charset="UTF-8">

    <title>bug 1691153</title>

</head>

<body>

<h1>bug 1691153</h1>

<script>

function toBlobURL(data, mimeType) {

  return URL.createObjectURL(

    new Blob([data], {

      type: mimeType,

})

);

// closing script element literal split up to not end the parent script element

let testurl = toBlobURL("<body></body>", "text/html");

addEventListener("message", event => {

  if (event.data == "getblob") {

    postMessage({ bloburl: testurl }, "*");

});

// the blob URL should have a content principal

</script>

</body>

</html>