LayoutTests/fast/dom/resources/callback-function-detached-frame-raf-iframe.html - WebKit - Git at Google

 <!DOCTYPE html>

 <script>
 function raf(key, FunctionConstructor = Function) {
     parent.requestAnimationFrame(FunctionConstructor(`
         top["${key}"]++;
     `));
 }
 </script>
	<!DOCTYPE html>

	<script>
	function raf(key, FunctionConstructor = Function) {
	parent.requestAnimationFrame(FunctionConstructor(`
	top["${key}"]++;
	`));
	}
	</script>