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<script>
document.addEventListener("DOMContentLoaded", async () => {
let a = document.createElementNS("http://www.w3.org/1999/xhtml", "canvas")
let bmp = await self.createImageBitmap(a.getContext("2d"), 100, -187, -214, 57, { })
let chan = new MessageChannel()
const worker = new Worker("none", { })
worker.postMessage([bmp, chan.port1], [bmp, chan.port1])
})
</script>
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