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Test Info:

<style id="a">
.z {
marker-mid: url(#blah);
display: inline-table;
contain: layout size;
}
</style>
<script>
function go() {
f.width;
a.appendChild(d);
}
</script>
<body onload="go()">
<base href="x"></base>
<div class="z">
<img id="f">
<datalist id="d"></datalist>
</div>
</body>