Sandbox::https://github.com/web-platform-tests/wpt/blob/master/css/cssom/StyleSheetList-constructable.html

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<!DOCTYPE html>

<html>

<head>

<title>CSSOM - StyleSheetList does not include adopted style sheets</title>

body { width: 50%; }

</style>

</head>

<body>

test(() => {

const sheet = new CSSStyleSheet();

document.adoptedStyleSheets = [sheet];

var styleSheets = document.styleSheets;

assert_equals(styleSheets.length, 1);

assert_equals(styleSheets[0], sheet1.sheet);

}, 'document.styleSheets does not include adopted style sheets');

</script>

</body>

</html>