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Test Info:

class="reftest-wait">
<head>
<script><![CDATA[
customElements.define("custom-td", class extends HTMLDivElement {
constructor() {
super();
this.attachShadow({ mode: "open" });
let td = document.createElement('td');
td.append(document.createElement('slot'));
this.shadowRoot.append(td);
}
}, {
extends: "div",
});
function f1() {
document.getElementById("outer")
.appendChild(document.createTextNode("PASS"));
document.documentElement.className = "";
}
]]></script>
</head>
<body onload="f1();">
<div is="custom-td" id="outer"></div>
</body>
</html>