Ok, this seems like it should be so simple.
I have a web app:
http://cloudmusiccompany.appspot.com/
It has the META tag:
<meta name="apple-mobile-web-app-capable" content="yes" />
I know that it only goes full screen when the user clicks the "+" at the bottom of the screen, and then launches the short cut.
But I've never been able to get it to show me the "+" button. I see the other, share button.
As you can see from the source, I have a splash screen and an icon.
I've tried putting the meta and link tags in different orders. Nothing seems to give me the "+" button.
You're correct that plus button was replaced in iOS 4.2 with the share button.
To set the home screen icon, use this meta tag:
<link rel="apple-touch-icon-precomposed" href="icon.png"/>
Or, this one if you want gloss added to the icon:
<link rel="apple-touch-icon" href="icon.png"/>
To set the splash screen, use:
<link rel="apple-touch-startup-image" href="splash.png" />