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Test Info:

<!DOCTYPE html>
<script id="w1">
self.onmessage = async () => {
try { self.close() } catch (e) {}
let a = new OffscreenCanvas(143, 178)
a.convertToBlob({ })
}
</script>
<script>
window.addEventListener('load', async () => {
const blob = new Blob([document.querySelector('#w1').textContent], { type: "text/javascript" })
const worker = new Worker(window.URL.createObjectURL(blob))
worker.postMessage([], [])
})
</script>