<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
@keyframes anim {
20% {
color: green;
}
}
a {
animation-name: anim;
animation-duration: 40s;
}
</style>
<style>
:link { background: red ! important; }
</style>
</head>
<body onload="document.documentElement.style.border = 'initial';">
<div><a href="data:text/html,unlikely to be visited"></a></div>
</body>
</html>