src/third_party/web_platform_tests/intersection-observer/zero-area-element-hidden.html - cobalt - Git at Google

 <!DOCTYPE html>
 <meta name="viewport" content="width=device-width,initial-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="./resources/intersection-observer-test-utils.js"></script>

 <style>
 /* Cobalt does not implement HTML5 spec for body margin. */
 body {
   margin: 8px;
 }
 pre, #log {
   position: absolute;
   top: 0;
   left: 200px;
 }
 #target {
   width: 0px;
   height: 0px;
   position: fixed;
   top: -1000px;
 }
 </style>

 <div id='target'></div>

 <script>
 var vw = document.documentElement.clientWidth;
 var vh = document.documentElement.clientHeight;

 var entries = [];

 runTestCycle(function() {
   var target = document.getElementById('target');
   assert_true(!!target, "target exists");
   var observer = new IntersectionObserver(function(changes) {
     entries = entries.concat(changes);
     window.testRunner.DoNonMeasuredLayout();
   });
   observer.observe(target);
   entries = entries.concat(observer.takeRecords());
   assert_equals(entries.length, 0, "No initial notifications.");
   runTestCycle(step0, "First rAF.");
 }, "A zero-area hidden target should not be intersecting.");
 window.testRunner.DoNonMeasuredLayout();
 window.testRunner.DoNonMeasuredLayout();

 function step0() {
   checkLastEntry(entries, 0, [8, 8, -1000, -1000, 0, 0, 0, 0, 0, vw, 0, vh, false]);
 }
 </script>
	<!DOCTYPE html>
	<meta name="viewport" content="width=device-width,initial-scale=1">
	<script src="/resources/testharness.js"></script>
	<script src="/resources/testharnessreport.js"></script>
	<script src="./resources/intersection-observer-test-utils.js"></script>

	<style>
	/* Cobalt does not implement HTML5 spec for body margin. */
	body {
	margin: 8px;
	}
	pre, #log {
	position: absolute;
	top: 0;
	left: 200px;
	}
	#target {
	width: 0px;
	height: 0px;
	position: fixed;
	top: -1000px;
	}
	</style>

	<div id='target'></div>

	<script>
	var vw = document.documentElement.clientWidth;
	var vh = document.documentElement.clientHeight;

	var entries = [];

	runTestCycle(function() {
	var target = document.getElementById('target');
	assert_true(!!target, "target exists");
	var observer = new IntersectionObserver(function(changes) {
	entries = entries.concat(changes);
	window.testRunner.DoNonMeasuredLayout();
	});
	observer.observe(target);
	entries = entries.concat(observer.takeRecords());
	assert_equals(entries.length, 0, "No initial notifications.");
	runTestCycle(step0, "First rAF.");
	}, "A zero-area hidden target should not be intersecting.");
	window.testRunner.DoNonMeasuredLayout();
	window.testRunner.DoNonMeasuredLayout();

	function step0() {
	checkLastEntry(entries, 0, [8, 8, -1000, -1000, 0, 0, 0, 0, 0, vw, 0, vh, false]);
	}
	</script>