LayoutTests/http/tests/intersection-observer/resources/nested-frame.html - WebKit - Git at Google

 <!DOCTYPE html>
 <style>
 #target {
   width: 50px;
   height: 100px;
   background-color: green;
 }

 #spacer {
   width: 50px;
   height: 200px;
 }
 </style>

 <div id="spacer"></div>
 <div id="target"</div>
	<!DOCTYPE html>
	<style>
	#target {
	width: 50px;
	height: 100px;
	background-color: green;
	}

	#spacer {
	width: 50px;
	height: 200px;
	}
	</style>

	<div id="spacer"></div>
	<div id="target"</div>