relappletouchiconprecomposed

Relappletouchiconprecomposed is not a standard term in web development. It appears to be a concatenation of the HTML link relation value apple-touch-icon-precomposed and the word rel, rather than a defined feature or element. In common practice, developers refer to Apple touch icons using the link rel attributes "apple-touch-icon" or "apple-touch-icon-precomposed" in the head of an HTML document.

Apple touch icons are used to provide a website icon when a user saves a page to the home screen on iOS devices. The two main rel values are apple-touch-icon and apple-touch-icon-precomposed. The precomposed variant was historically used to indicate that the icon image already includes any gloss or shading, so iOS would not apply additional styling. The non-precomposed version allowed iOS to apply its default gloss and effects to the icon.

Usage typically involves including one or more link elements in the page head, for example: <link rel="apple-touch-icon-precomposed" href="/icons/apple-touch-icon-precomposed.png" sizes="180x180">. In modern practice, many developers use the simpler apple-touch-icon and provide multiple sizes to accommodate different devices, such as 120x120, 152x152, 167x167, and 180x180 pixels.

Notes and status: Since iOS 7, the visual treatment of home screen icons changed, and the distinction between precomposed and non-precomposed icons became less critical. However, including appropriate icons remains useful for a polished appearance on iOS devices. If encountered, the intended meaning is usually the precomposed variant of the Apple touch icon, or simply the general Apple touch icon mechanism.