<!DOCTYPE html>
<html lang="en-US">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
@keyframes jiggle{
from{
transform: translateY(0);
}
to{
transform: translateY(25px);
}
}
@media (update: fast) {
h1{
animation: 1s jiggle linear alternate infinite;
}
}
</style>
</head>
<body>
<h1>CSS @media update</h1>
<p><strong>Note</strong>: CSS @media update is not supported in any web browser.</p> </body>
</html>