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Test Info:

<!DOCTYPE html>
<style>
div { color: red; }
div::first-line { color: green }
#table { display: inline-table; }
#caption { display: table-caption; }
#tbody { display: table-row-group; }
</style>
<div id="x">
<span id="table">
<span id="tbody">be green</span>
</span>
</div>
<script>
x.offsetWidth;
var caption = document.createElement("span");
caption.id = "caption";
caption.textContent = "This should";
table.insertBefore(caption, tbody);
</script>