Well... i try some code in this device ( both have Jelly Bean )
Android 4.1.1 ( Huawei )
Android 4.2.2 ( Asus )
And both work.
I suspect that the problem is with devices with KitKat.
Today this is market ( Lollipo 34,1%, KitKat 35,5%, Jelly Bean ... )
After a few research i read that:
"Android 4.4 ( KitKat ) has made a big change in the OS’ internals for HTML5 development: it has replaced its original WebKit-based WebView with modern Chromium
Even matching Chrome 30 for Android, the Web View (and potentially the Android Browser) will not have support (no reasons given) for:
•WebGL
•WebRTC
•WebAudio
•FullScreen
•Form validation"
And again
THIS.