File: subframe-that-posts-html-containing-blob-url-to-parent.html

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<!DOCTYPE html>
<meta charset="utf-8">
<script>
fetch('html-correctly-labeled.html')
    .then(response => response.blob())
    .then(blob => {
        let msg = { blob_size: blob.size,
                    blob_type: blob.type,
                    blob_url: URL.createObjectURL(blob) };
        window.parent.postMessage(msg, '*');
    })
    .catch(error => {
        let msg = { error: error };
        window.parent.postMessage(msg, '*');
    });
</script>