test/4.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Prefetch experiments</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
</head>
<body>
    <h1>Page 4</h1>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Soluta est sint assumenda corrupti minima aut, magnam totam beatae ullam ea iste voluptatum iusto expedita animi rem vitae rerum atque nemo!</p>
</body>
</html>