What is rel=apple-touch-icon?
- Use of rel=apple-touch-icon defines an image to be used on Apple devices that represents that page or site.
The above code is basically saying...
- There is an icon for this page
- The icon is located at "/custom_icon.png"
Where is it used?
In the head portion of an HTML document.
The main reason for rel=apple-touch-icon to exist is to provide an image that represents the page, typically a logo.
Accomplishes what a favicon does for Windows systems by providing an image for bookmarks, saves, links, etc. to be displayed on Apple devices.