Why might meta for webapp not work?

Question

iOS

Why these meta tags may not work on a webapp page on ios:

<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">

The status bar should be transparent and overlay on top of the html, but it's just black and pushes the content below it.

<link rel="apple-touch-startup-image" href="img/launch.png">

Splashscreen prepared in iPhone resolution does not appear.
There are also the following tags:

<meta name="apple-touch-fullscreen" content="yes">
<meta name="mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-capable" content="yes" />