Tamaños y declaraciones para los `apple-touch-icons`

index.html

<!-- 
  Íconos para iOS 
-->

<!-- iPhone -->
<link rel="apple-touch-icon" href="57x57.png" />

<!-- iPad -->
<link rel="apple-touch-icon" sizes="72x72" href="72x72.png" />

<!-- iPhone Retina -->
<link rel="apple-touch-icon" sizes="114x114" href="114x114.png" />

<!-- iPad Retina -->
<link rel="apple-touch-icon" sizes="144x144" href="144x144.png" />


<!--
  Startup Images
-->

<!-- iPhone < 4 -->
<link rel="apple-touch-startup-image" href="/resources/img/startups/320x460.png" media="screen and (max-device-width : 320px)">

<!-- iPhone < 5 -->
<link rel="apple-touch-startup-image" href="/resources/img/startups/640x920.png" media="(max-device-width : 480px) and (-webkit-min-device-pixel-ratio : 2)">

<!-- iPhone >= 5 -->
<link rel="apple-touch-startup-image" href="/resources/img/startups/640x1096.png" media="(max-device-width : 548px) and (-webkit-min-device-pixel-ratio : 2)">

<!-- iPad Portrait -->
<link rel="apple-touch-startup-image" sizes="768x1004" href="/resources/img/startups/768x1004.png" media="screen and (min-device-width : 481px) and (max-device-width : 1024px) and (orientation : portrait)">

<!-- iPad Landscape -->
<link rel="apple-touch-startup-image" sizes="1024x748" href="/resources/img/startups/1024x748.png" media="screen and (min-device-width : 481px) and (max-device-width : 1024px) and (orientation : landscape)">

<!-- iPad Retina Portrait -->
<link rel="apple-touch-startup-image" sizes="1536x2008" href="/resources/img/startups/1536x2008.png" media="screen and (-webkit-min-device-pixel-ratio : 2) and (min-device-width : 481px) and (max-device-width : 2048px) and (orientation : portrait)">

<!-- iPad Retina Landscape-->
<link rel="apple-touch-startup-image" sizes="2048x1496" href="/resources/img/startups/2048x1496.png" media="screen and (-webkit-min-device-pixel-ratio : 2) and (min-device-width : 481px) and (max-device-width : 2048px) and (orientation : landscape)">