<iframe></iframe>
body{
background:gray;
}
iframe{
background:#fff;
}
const blob = new Blob(['<!DOCTYPE html><html><head><meta charset="utf-8"><title></title></head><body>hello world!!!</body></html>'],{ "type" : "text/html" })
const iframeDom = document.getElementsByTagName('iframe')[0]
const iframeSrc = URL.createObjectURL(blob)
iframeDom.src = iframeSrc
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