LayoutTests/scrollingcoordinator/ios/relative-layer-should-move-with-scroll.html - WebKit - Git at Google

 <!DOCTYPE html> <!-- webkit-test-runner [ useFlexibleViewport=true internal:AsyncOverflowScrollingEnabled=true ] -->
 <html>
 <head>
     <meta name="viewport" content="initial-scale=1.0">
     <style>
         #scroller {
             margin: 10px;
             height: 300px;
             width: 300px;
             border: 1px solid black;
             overflow: scroll;
         }

         .box {
             position: relative;
             z-index: 0; /* stacking context ancestor is the root */
             top: 250px;
             width: 200px;
             height: 200px;
             background-color: blue;
         }

         .scroll-content {
             height: 2000px;
         }
     </style>
     <script>
         if (window.testRunner)
             testRunner.waitUntilDone();

         function getUnstableScrollScript(x, y, scrollX, scrollY)
         {
             return `(function() {
                 uiController.scrollUpdatesDisabled = true;
                 uiController.immediateScrollElementAtContentPointToOffset(${x}, ${y}, ${scrollX}, ${scrollY});
                 uiController.doAfterPresentationUpdate(function() {
                     uiController.uiScriptComplete();
                 });
             })();`;
         }

         function doTest()
         {
             if (!testRunner.runUIScript)
                 return

             testRunner.runUIScript(getUnstableScrollScript(50, 50, 0, 250), () => {
                 testRunner.notifyDone();
             });
         }

         window.addEventListener('load', doTest, false);
     </script>
 </head>
 <body>
     <div id="scroller">
         <div class="scroll-content">
             <div class="box"></div>
         </div>
     </div>
 </body>
 </html>
	<!DOCTYPE html> <!-- webkit-test-runner [ useFlexibleViewport=true internal:AsyncOverflowScrollingEnabled=true ] -->
	<html>
	<head>
	<meta name="viewport" content="initial-scale=1.0">
	<style>
	#scroller {
	margin: 10px;
	height: 300px;
	width: 300px;
	border: 1px solid black;
	overflow: scroll;
	}

	.box {
	position: relative;
	z-index: 0; /* stacking context ancestor is the root */
	top: 250px;
	width: 200px;
	height: 200px;
	background-color: blue;
	}

	.scroll-content {
	height: 2000px;
	}
	</style>
	<script>
	if (window.testRunner)
	testRunner.waitUntilDone();

	function getUnstableScrollScript(x, y, scrollX, scrollY)
	{
	return `(function() {
	uiController.scrollUpdatesDisabled = true;
	uiController.immediateScrollElementAtContentPointToOffset(${x}, ${y}, ${scrollX}, ${scrollY});
	uiController.doAfterPresentationUpdate(function() {
	uiController.uiScriptComplete();
	});
	})();`;
	}

	function doTest()
	{
	if (!testRunner.runUIScript)
	return

	testRunner.runUIScript(getUnstableScrollScript(50, 50, 0, 250), () => {
	testRunner.notifyDone();
	});
	}

	window.addEventListener('load', doTest, false);
	</script>
	</head>
	<body>
	<div id="scroller">
	<div class="scroll-content">
	<div class="box"></div>
	</div>
	</div>
	</body>
	</html>