<!DOCTYPE html>
<html>
<head>
<title>This tests that auto transition returns the proper computed value.</title>
<style>
#dropdown {
    overflow: hidden;
    border: 1px solid red;
    height: 18px;
    transition: height 1s ease-out;
}
</style>
</head>
<body>
<div id=dropdown></div>
PASS if you can see foobar above.
</body>
</html>