<script>
if (window.testRunner)
    testRunner.dumpAsText();
</script>
<style>
h3 {
    border-top : 1px solid red;
}
* {
    padding-inline-start : 91%;
    padding-inline-start : 91%;
    margin: auto auto;
}
</style>
Pass if no assert in debug.
<h3><dt><h3></h3></dt></h3>