linear-viewport-ref.html
<body style="border: 0; margin: 0; padding: 0;"><div style="background: -moz-linear-gradient(blue, aqua) no-repeat; width: 100%; height: 100%;"> </div></body>
<body style="border: 0; margin: 0; padding: 0;"><div style="background: -moz-linear-gradient(blue, aqua) no-repeat; width: 100%; height: 100%;"> </div></body>