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This has been asked multiple times here, but without a solid and understandable answer. This is a web-app, not a native-app.
I'm using:
<link rel="apple-touch-startup-image" href="images/startup.png" />
to display the startup image. It loads fine if the image's resolution is 320x460. I tried using the retina's resolution which is 640x920 (40px are taken out by the status bar), that didn't work. I've tried the @2x thing, that failed too.
Is it even possible [yet]?