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<script>
function go() {
let host = document.createElement('div');
let style_1 = document.createElement('style');
let style_2 = document.createElement('style');
let otherElement = document.createElement('div');
let shadowRoot = host.attachShadow({mode: "open"});
style_1.title = 'x';
style_2.title = 'y';
document.head.appendChild(style_1);
shadowRoot.appendChild(style_2);
document.documentElement.appendChild(otherElement);
otherElement.before('', host, '');
}
window.addEventListener('load', go)
</script>
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