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var orientation = window.screen.orientation;

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var orientation =
  (screen.orientation || {}).type ||
  screen.mozOrientation ||
  screen.msOrientation;

if (orientation === "landscape-primary") {
  console.log("That looks good.");
} else if (orientation === "landscape-secondary") {
  console.log("Mmmh... the screen is upside down!");
} else if (
  orientation === "portrait-secondary" ||
  orientation === "portrait-primary"
) {
  console.log("Mmmh... you should rotate your device to landscape");
} else if (orientation === undefined) {
  console.log("The orientation API isn't supported in this browser :(");
}