HTML5 in android player

Hi guys,

I’m using the android client and i have some php pages,inputted in timeline with web page module in my screen playlist
Sometimes i have issues with internet connection, so i wanna increase some pages with offline support.

Can i use the html5 functions “CACHE MANIFEST” and “LOCAL STORAGE”, for create offline pages?

Native android webview browser have support to HTML5 functions?

I’m using android 4.4.2 and xibo client 1.7 licensed.