For web icons on iPhone or iPad, use the Apple Touch Icon or apple-touch-icon.png file. This icon will be used when someone bookmarks your page.
For multiple icons with different device resolutions, such as iPhone or iPad, add the sizes attribute to each link element as follows −
<link rel = "apple-touch-icon" href = "touch-icon-iphone.png">
<link rel = "apple-touch-icon" sizes = "160x160" href = "touch-icon-ipad.png"> <link rel = "apple-touch-icon" sizes = "170x170" href = "touch-icon-iphone-retina.png"> <link rel = "apple-touch-icon" sizes = "180x180" href = "touch-icon-ipad-retina.png">
Use icons that are sized appropriately for the device.
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