LayoutTests/compositing/animation/transform-after-animation.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
     <style>
         .stage {
             margin: 20px;
             width: 300px; height: 250px;
             border: 2px solid black;
             transform-style: preserve-3d;
         }

         .slide {
             width: 100%;
             height: 100%;
             animation-duration: 20ms;
             animation-fill-mode: forwards;
             -webkit-backface-visibility: hidden;
             background-color: blue;
         }

         .animating {
             animation-name: slide;
         }

         @keyframes slide {
             0% {   transform-origin: 50% 50%; transform: translateX(400px); }
             50% {  transform-origin: 50% 50%; transform: translateX(0px); }
             100% { transform-origin: 50% 50%; transform: translateX(0px); }
         }
     </style>
     <script>
         if (window.testRunner)
             testRunner.waitUntilDone();

         function animationEnded()
         {
             if (window.testRunner)
                 testRunner.notifyDone();
         }

         window.addEventListener('load', () => {
             document.getElementById('target').classList.add('animating');
         }, false);
     </script>
 </head>
 <body>
     <div class="stage">
         <div id="target" class="slide" onanimationend="animationEnded()"></div>
     </div>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<style>
	.stage {
	margin: 20px;
	width: 300px; height: 250px;
	border: 2px solid black;
	transform-style: preserve-3d;
	}

	.slide {
	width: 100%;
	height: 100%;
	animation-duration: 20ms;
	animation-fill-mode: forwards;
	-webkit-backface-visibility: hidden;
	background-color: blue;
	}

	.animating {
	animation-name: slide;
	}

	@keyframes slide {
	0% { transform-origin: 50% 50%; transform: translateX(400px); }
	50% { transform-origin: 50% 50%; transform: translateX(0px); }
	100% { transform-origin: 50% 50%; transform: translateX(0px); }
	}
	</style>
	<script>
	if (window.testRunner)
	testRunner.waitUntilDone();

	function animationEnded()
	{
	if (window.testRunner)
	testRunner.notifyDone();
	}

	window.addEventListener('load', () => {
	document.getElementById('target').classList.add('animating');
	}, false);
	</script>
	</head>
	<body>
	<div class="stage">
	<div id="target" class="slide" onanimationend="animationEnded()"></div>
	</div>
	</body>
	</html>