<html>
<head>
<title>CSS3 media query test: media query testing aspect-ratio feature.</title>
<style type="text/css">
@media screen and (aspect-ratio:800/600) {
#a { color: green }
}
@media screen and (min-aspect-ratio:1/1) {
#b { color: green }
}
@media screen and (max-aspect-ratio:1/1) {
#c { color: green }
}
@media screen and (min-aspect-ratio:16/9) {
#d { color: green }
}
</style>
</head>
<body>
  <p id="a">This text should be green if the viewport is 800:600 ratio. This is unlikely to happen
    by chance, but the layout testing sets this size</p>
  <p id="b">This text should be green if the viewport is landscape (minimum aspect ratio of 1:1).</p>
  <p id="c">This text should be green if the viewport is portrait (maximum aspect ratio of 1:1).</p>
  <p id="d">This text should be green if the viewport aspect ratio is greater than 16:9.</p>
</body>
</html>