<!DOCTYPE html>
<head>
<style>
img {
position: absolute;
left: 100px;
top: 100px;
}
</style>
<script>
if (window.testRunner) {
addEventListener('load', function() {
// Zoom in three times. Since the image has sizes=50vw it should
// remain the same size since the viewport shrinks during a zoom.
testRunner.zoomPageIn();
testRunner.zoomPageIn();
testRunner.zoomPageIn();
});
}
</script>
</head>
<body>
<img src="resources/black.png" sizes="50vw" srcset="resources/black.png 100w">
</body>