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Test Info:

<style>
.cl {
display: list-item;
list-style-position: inside;
position: relative;
}
#b { position: absolute; }
</style>
<script>
function go() {
a.appendChild(b);
}
</script>
<body onload=go()>
<progress id="a"></progress>
<details class="cl">
<summary id="b">