<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<span xmlns="someNamespace" xmlns:html="http://www.w3.org/1999/xhtml">
    <html:span id="target"/>
</span>
<script>
<![CDATA[

test(() => {
    const element = document.getElementById("target");
    element.innerHTML = '<b /><html:b />';
    assert_equals(element.firstChild.prefix, null);
    assert