<!doctype html>
<html>
<head>
<style>
#test1 {
    animation:test1 3s steps(1,end) 0s 1 normal both
}
#test2 {
    animation:test2 3s steps(1,end) 0s 1 normal both
}
@keyframes test1 {
    from {visibility: hidden}
    to {visibility: visible}
}
@keyframes test2 {
    from {color: green}
    to {color: red}
}
</style>
</head>
<body>
<div id=test1>
This shouldn't be initially visible
<div>This shouldn't be initially visible</div>
</div>
<div id=test2>
This should be initially green
<div>This should be initially green</div>
</div>
<script>
if (window.testRunner) {
    testRunner.waitUntilDone();
    test2.onanimationstart = () => testRunner.notifyDone();
}
</script>
</body>
</html>