src/third_party/web_platform_tests/html/semantics/grouping-content/the-ol-element/reversed-1c.html - cobalt - Git at Google

 <!DOCTYPE html>
 <ol id="x" reversed>
   <li>Three</li>
   <li>Two</li>
 </ol>
 <script>
   var l = document.getElementById("x");
   var w = l.offsetWidth;
   var li = document.createElement("li");
   li.textContent = "One"
   l.appendChild(li);
 </script>
	<!DOCTYPE html>
	<ol id="x" reversed>
	<li>Three</li>
	<li>Two</li>
	</ol>
	<script>
	var l = document.getElementById("x");
	var w = l.offsetWidth;
	var li = document.createElement("li");
	li.textContent = "One"
	l.appendChild(li);
	</script>