Available in Chrome 39+
In lieu of the <meta> and <link> elements used in
other samples,
I'm using a web application manifest via a
<link rel="manifest" href="manifest.json"> tag in my <head>.
Try me out in Chrome 39+ on Android: from Chrome's menu, select Add to homescreen.
When you tap the new icon on your homescreen, I'll launch as a standalone app, with the page displayed in landscape orientation.