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class="reftest-wait">
<script type="text/javascript"><![CDATA[
function run() {
const HTML_NS = "http://www.w3.org/1999/xhtml";
var window = document.getElementsByTagName("window")[0];
var span = document.createElementNS(HTML_NS, "html:span");
window.appendChild(span); // causes block wrapping
setTimeout(finish, 0);
}
function finish() {
document.documentElement.removeAttribute("class");
}
function load(event) {
setTimeout(run, 0);
}
window.addEventListener("load", load, false);
]]></script>
<box flex="1" />
<label value="hello world" />
</window>