How come the iPhone won't pick this up?

<link rel="stylesheet" media="only screen and (min-device-width: 721px)" href="css/styletab.css">
<link rel="stylesheet" media="only screen and (max-device-width: 720px)" href="css/style.css"

It always defaults to styletab.css. Works on android.

Added (1). <link rel="stylesheet" media="only screen and (max-device-width: 720px)" href="css/style.css" >

Are you positive the device-width is less than 721px? Maybe the iPhone actually uses the native resolution and thus correctly chooses styletab.css?

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