ranbena/landscape-fullscreen-event.js

## landscape-fullscreen-event.js
// attach to window resize event
window.addEventListener("resize", function(e) {
  // determine current orientation
  var isLandscape = Math.abs(window.orientation) == 90;
  if (isLandscape) {
    // do something
  }
});

## standalone-meta.html
<meta name="apple-mobile-web-app-capable" content="yes" />
	// attach to window resize event
	window.addEventListener("resize", function(e) {
	// determine current orientation
	var isLandscape = Math.abs(window.orientation) == 90;
	if (isLandscape) {
	// do something
	}
	});