Why splash screen doesn't work

If I out something like this in my index.html I should see splash screen.

This usually works but not when I use Sencha Touch.

Is this some kind of bug in Sencha Touch?

<link rel="apple-touch-startup-image" href="apple-touch-startup-image-iphone.png"

media="screen and (max-device-width : 320px)">

Why splash screen doesn't work