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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait">
<head>
<script>
customElements.define("custom-element", class extends HTMLElement {
constructor() {
super();
const template = document.getElementById("template");
const shadowRoot = this.attachShadow({mode: "open"})
.appendChild(template.content.cloneNode(true));
}
});
function doTest() {
var l = document.getElementById("l");
l.parentNode.insertBefore(document.createTextNode("y"), l);
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="doTest()">
<template id="template">
<style>
#hasBefore::before { content: "x"; }
</style>
<span id="hasBefore"><slot/></span>
</template>
<custom-element style="font-size: 300%; display: block;"><span id="l"></span></custom-element>
</body>
</html>
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