@hint/hint-apple-touch-icons
v4.0.23
Published
hint for best practices related to the apple-touch-icons
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Use Apple touch icon (apple-touch-icons)
apple-touch-icons requires that at least one Apple touch icon is present and
of a standard size.
Why is this important?
Since iOS 1.1.3, Safari for iOS has supported a way for developers
to specify an image that will be used to represent the web site or app
on the home screen. The image is known as the touch icon.
<link rel="apple-touch-icon" href="apple-touch-icon.png">Per Apple's current guidance, default touch icon sizes are as follows:
Device or context | Icon size -- | -- iPhone | 180px × 180px (60pt × 60pt @3x) iPhone (X/Plus) | 120px × 120px (60pt × 60pt @2x) iPad Pro | 167px × 167px (83.5pt × 83.5pt @2x) iPad, iPad mini | 152px × 152px (76pt × 76pt @2x)
Other notes:
Not declaring the touch icon in the page and having it in the root of the site is not recommended, as Apple may change what is requested by default.
In older versions of Safari for iOS, the
precomposedkeyword could be used to prevent iOS from adding different visual effects to the touch icon (i.e., rounded corners, drop shadow, reflective shine). Starting with iOS 7, no special effects are applied to touch icons, so there is no need to use theprecomposedkeyword anymore.When using one image, there is no need to use the
sizesattribute.As of
iOS 11.1.0, Safari for iOS supports the web app manifest file which provides a standard, cross-browser way of defining, among other, the icons browsers can use in various contexts (home screen, application menu, etc.). However, Safari ignores the icons defined in the web app manifest and still uses the non-standardapple-touch-icon.
What does the hint check?
The hint checks if one or more apple-touch-icon declarations exist in
the <head>, and:
- each has
rel="apple-touch-icon" - each declared image is accessible (e.g., doesn’t result in a
404), - each declared image is a
PNGof one of the resolutions specified above
Examples that trigger the hint
No apple-touch-icon was specified:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>example</title>
...
</head>
<body>...</body>
</html>The apple-touch-icon is not specified in <head>:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>example</title>
...
</head>
<body>
<link rel="apple-touch-icon" href="apple-touch-icon.png">
...
</body>
</html>The apple-touch-icon has a rel attribute different than
apple-touch-icon:
<link rel="apple-touch-icon-precomposed" sizes="180x180" href="apple-touch-icon-precomposed.png">The apple-touch-icon is not accessible:
<link rel="apple-touch-icon" href="apple-touch-icon.png">Response for apple-touch-icon.png:
HTTP/... 404 Not Found
...
HTTP/... 500 Internal Server Error
...The apple-touch-icon is not a PNG file:
<link rel="apple-touch-icon" href="apple-touch-icon.png">$ file apple-touch-icon.png
apple-touch-icon.png: JPEG image data, ...One or more apple-touch-icon files is not a recommended size:
<link rel="apple-touch-icon" href="apple-touch-icon.png">$ file apple-touch-icon.png
apple-touch-icon.png: PNG image data, 16 x 16, ...Examples that pass the hint
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>example</title>
...
<link rel="apple-touch-icon" href="/apple-touch-icon.png">
...
</head>
<body>...</body>
</html>How to use this hint?
This package is installed automatically by webhint:
npm install hint --save-devTo use it, activate it via the .hintrc configuration file:
{
"connector": {...},
"formatters": [...],
"hints": {
"apple-touch-icons": "error",
...
},
"parsers": [...],
...
}Note: The recommended way of running webhint is as a devDependency of
your project.