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Test Info:

<script>
window.addEventListener('load', () => {
var a = document.createElementNS('http://www.w3.org/1999/xhtml', 'div')
var b = new CSSStyleSheet({'disabled': true})
var c = a.attachShadow({'mode': 'closed'})
c.adoptedStyleSheets = [new CSSStyleSheet(), b, b]
b.disabled = false
})
</script>