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Test Info:

<html>
<head>
<script>
addEventListener("load", () => {
const anchor = document.createElement("a");
const b = document.createElement("b");
const c = document.createElement("c");
document.documentElement.appendChild(anchor);
anchor.appendChild(b);
b.setAttribute("contenteditable", "true");
// For emulating the traditional behavior, collapse Selection to end of the
// <body> which must be empty because this test appends the new elements after
// the <body>.
const selection = self.getSelection();
selection.collapse(document.body, document.body.childNodes.length);
b.appendChild(c);
c.outerHTML = '<s contenteditable="false"><b contenteditable="true">';
selection.setBaseAndExtent(document, 0, document.documentElement, 0);
const range = selection.getRangeAt((260523900 % selection.rangeCount));
selection.selectAllChildren(b);
range.collapse(false);
range.setEndAfter(document.documentElement);
range.extractContents();
});
</script>
</head>
</html>