apple-touch-icon

    (apple-touch-icon.png) Apple's default icon
   (image) used to represent a website, e.g. when saved as a
   bookmark or on the home screen of an iOS device such as an
   iPhone or iPad.

   Apple's scheme allows a site to offer images of different sizes so
   the client can choose the most appropriate one according to its
   screen size and resolution.

   Apple devices and applications completely ignore the favicon.ico
   de facto standard which, while somewhat quirky in its use of the
   ico format, has been pretty much universally adopted elsewhere.
   Conversely, apple-touch-icon.png will be ignored by non-Apple
   devices, possibly because its 16x16 resolution would look pretty
   shabby on most smart phones.

   The icon can be provided in various different resolutions for
   different screen sizes and resolutions,
   e.g. apple-touch-icon-152x152.png for retina iPad with
   iOS7.


   
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   <https://realfavicongenerator.net/faq>.

   (2018-08-19)