LayoutTests/scrollingcoordinator/ios/ui-scroll-fixed.html - WebKit - Git at Google

 <!DOCTYPE html> <!-- webkit-test-runner [ useFlexibleViewport=true ] -->

 <html>
 <head>
     <meta name="viewport" content="initial-scale=1.0">
     <style>
         body {
             height: 2000px;
             margin: 0;
         }

         #fixed {
             position: fixed;
             top: 200px;
             left: 20px;
             height: 100px;
             width: calc(100% - 40px);
             background-color: blue;
         }

         #container {
             position: absolute;
             z-index: 0;
             top: 50px;
             left: 0;
             height: 400px;
             width: 100%;
             border: 2px solid black;
             box-sizing: border-box;
             overflow: hidden; /* Forces compositing on this layer */
         }

         #container.changed {
             top: 100px;
         }
     </style>
     <script src="../../resources/ui-helper.js"></script>
     <script>
         if (window.testRunner)
             testRunner.waitUntilDone();

         async function runTest()
         {
             if (!testRunner.runUIScript)
                 return

             await UIHelper.delayFor(0);
             await UIHelper.immediateUnstableScrollTo(0, 55);
             await UIHelper.delayFor((120)); // Wait for scrollbars to disappear.
             document.getElementById('container').classList.add('changed');
             testRunner.notifyDone();
         }

         window.addEventListener('load', runTest, false);
     </script>
 </head>
 <body>
     <div id="container">
         <div id="fixed"></div>
     </div>
 </body>
 </html>
	<!DOCTYPE html> <!-- webkit-test-runner [ useFlexibleViewport=true ] -->

	<html>
	<head>
	<meta name="viewport" content="initial-scale=1.0">
	<style>
	body {
	height: 2000px;
	margin: 0;
	}

	#fixed {
	position: fixed;
	top: 200px;
	left: 20px;
	height: 100px;
	width: calc(100% - 40px);
	background-color: blue;
	}

	#container {
	position: absolute;
	z-index: 0;
	top: 50px;
	left: 0;
	height: 400px;
	width: 100%;
	border: 2px solid black;
	box-sizing: border-box;
	overflow: hidden; /* Forces compositing on this layer */
	}

	#container.changed {
	top: 100px;
	}
	</style>
	<script src="../../resources/ui-helper.js"></script>
	<script>
	if (window.testRunner)
	testRunner.waitUntilDone();

	async function runTest()
	{
	if (!testRunner.runUIScript)
	return

	await UIHelper.delayFor(0);
	await UIHelper.immediateUnstableScrollTo(0, 55);
	await UIHelper.delayFor((120)); // Wait for scrollbars to disappear.
	document.getElementById('container').classList.add('changed');
	testRunner.notifyDone();
	}

	window.addEventListener('load', runTest, false);
	</script>
	</head>
	<body>
	<div id="container">
	<div id="fixed"></div>
	</div>
	</body>
	</html>