Windows 8 preloader (loading icon) using HTML5 and javascript without images

Question

I noticed a simple thing while looking at the screen of Windows 8 loading screen, there is a preloader (or loading icon) which is quite interesting, it has a bit of gravity/swin

Answer 1

I discovered you could find a similar script on C:\Windows\WinStore\WinStore.css and WinStore.htm, Just open Winstore.htm and you will discover a similar ring loading animation, provided by IE10, if only someone could dump the animation info from Windows Shell... If you see with Notepad the WinStore.css you will see something like this:

splashProgress::-ms-fill
{
    animation-name: **-ms-ring**;
}

Is that variable an animation info stored somewhere in the Windows Shell???

I tested loading the HTML page in Chrome and Firefox, nothing, just a normal loading bar.

Sorry for my bad english. I'm from Argentina.