[yogo]

Doesn't work for me on Android 4.2.

Edit: version 4.2 Android Browser. I scrolled a good enough distance down the page.

[hiphopyo]

Maybe you need a polyfill or something? Those Android browsers are the new IE.

[WickyNilliams]

Correct, a number of polyfills are needed for older browsers - requestAnimationFrame, Function.prototype.bind and classList. This is detailed in the "browser support" section of the website