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The HTML element specifies relationships between the current document and an external resource. This element is most commonly used to link to stylesheets, but is also used to establish site icons (both "favicon" style icons and icons for the home screen and apps on mobile devices) among other things.
The sizes attribute indicates the icon size, while the type contains the MIME type of the resource being linked. These provide useful hints to allow the browser to choose the most appropriate icon available.
A rel value of preload indicates that the browser should preload this resource (see rel="preload" for more details), with the as attribute indicating the specific class of content being fetched. The crossorigin attribute indicates whether the resource should be fetched with a CORS request.
This attribute is required when rel="preload" has been set on the element, optional when rel="modulepreload" has been set, and otherwise should not be used. It specifies the type of content being loaded by the , which is necessary for request matching, application of correct content security policy, and setting of correct Accept request header.
This attribute explicitly indicates that certain operations should be blocked on the fetching of an external resource. It must only be used when the rel attribute contains expect or stylesheet keywords. The operations that are to be blocked must be a space-separated list of blocking tokens listed below.
A cross-origin request (i.e. with an Origin HTTP header) is performed, but no credential is sent (i.e. no cookie, X.509 certificate, or HTTP Basic authentication). If the server does not give credentials to the origin site (by not setting the Access-Control-Allow-Origin HTTP header) the resource will be tainted and its usage restricted.
A cross-origin request (i.e. with an Origin HTTP header) is performed along with a credential sent (i.e. a cookie, certificate, and/or HTTP Basic authentication is performed). If the server does not give credentials to the origin site (through Access-Control-Allow-Credentials HTTP header), the resource will be tainted and its usage restricted.
If the attribute is not present, the resource is fetched without a CORS request (i.e. without sending the Origin HTTP header), preventing its non-tainted usage. If invalid, it is handled as if the enumerated keyword anonymous was used. See CORS settings attributes for additional information.
For rel="stylesheet" only, the disabled Boolean attribute indicates whether the described stylesheet should be loaded and applied to the document. If disabled is specified in the HTML when it is loaded, the stylesheet will not be loaded during page load. Instead, the stylesheet will be loaded on-demand, if and when the disabled attribute is changed to false or removed.
This attribute indicates the language of the linked resource. It is purely advisory. Allowed values are specified by RFC 5646: Tags for Identifying Languages (also known as BCP 47). Use this attribute only if the href attribute is present.
For rel="preload" and as="image" only, the imagesizes attribute is a sizes attribute that indicates to preload the appropriate resource used by an img element with corresponding values for its srcset and sizes attributes.
For rel="preload" and as="image" only, the imagesrcset attribute is a sourceset attribute that indicates to preload the appropriate resource used by an img element with corresponding values for its srcset and sizes attributes.
This attribute defines the sizes of the icons for visual media contained in the resource. It must be present only if the rel contains a value of icon or a non-standard type such as Apple's apple-touch-icon. It may have the following values:
Note: Most icon formats are only able to store one single icon; therefore, most of the time, the sizes attribute contains only one entry. Microsoft's ICO format and Apple's ICNS format can store multiple icon sizes in a single file. ICO has better browser support, so you should use this format if cross-browser support is a concern.
This attribute is used to define the type of the content linked to. The value of the attribute should be a MIME type such as text/html, text/css, and so on. The common use of this attribute is to define the type of stylesheet being referenced (such as text/css), but given that CSS is the only stylesheet language used on the web, not only is it possible to omit the type attribute, but is actually now recommended practice. It is also used on rel="preload" link types, to make sure the browser only downloads file types that it supports.
The value of this attribute shows the relationship of the current document to the linked document, as defined by the href attribute. The attribute thus defines the reverse relationship compared to the value of the rel attribute. Link type values for the attribute are similar to the possible values for rel.
Note: Instead of rev, you should use the rel attribute with the opposite link type value. For example, to establish the reverse link for made, specify author. Also, this attribute doesn't stand for "revision" and must not be used with a version number, even though many sites misuse it in this way.
For information about what sizes to choose for Apple icons, see Apple's documentation on configuring web applications and the referenced Apple human interface guidelines. Usually, it is sufficient to provide a large image, such as 192x192, and let the browser scale it down as needed, but you may want to provide images with different levels of detail for different sizes, as the Apple design guideline recommends. Providing smaller icons for lower resolutions also saves bandwidth.
It may not be necessary to provide elements at all. For example, browsers automatically request /favicon.ico from the root of a site, and Apple also automatically requests /apple-touch-icon-[size].png, /apple-touch-icon.png, etc. However, providing explicit links protects you against changes to these conventions.
You can determine when a style sheet has been loaded by watching for a load event to fire on it; similarly, you can detect if an error has occurred while processing a style sheet by watching for an error event:
\n The HTML element specifies relationships between the current document and an external resource.\n This element is most commonly used to link to stylesheets, but is also used to establish site icons (both \"favicon\" style icons and icons for the home screen and apps on mobile devices) among other things.\n
\n The sizes attribute indicates the icon size, while the type contains the MIME type of the resource being linked.\n These provide useful hints to allow the browser to choose the most appropriate icon available.\n
\n A rel value of preload indicates that the browser should preload this resource (see rel=\"preload\" for more details), with the as attribute indicating the specific class of content being fetched.\n The crossorigin attribute indicates whether the resource should be fetched with a CORS request.\n
\n This attribute is required when rel=\"preload\" has been set on the element, optional when rel=\"modulepreload\" has been set, and otherwise should not be used.\n It specifies the type of content being loaded by the , which is necessary for request matching, application of correct content security policy, and setting of correct Accept request header.\n
\n A cross-origin request (i.e. with an Origin HTTP header) is performed, but no credential is sent (i.e. no cookie, X.509 certificate, or HTTP Basic authentication).\n If the server does not give credentials to the origin site (by not setting the Access-Control-Allow-Origin HTTP header) the resource will be tainted and its usage restricted.\n
\n A cross-origin request (i.e. with an Origin HTTP header) is performed along with a credential sent (i.e. a cookie, certificate, and/or HTTP Basic authentication is performed).\n If the server does not give credentials to the origin site (through Access-Control-Allow-Credentials HTTP header), the resource will be tainted and its usage restricted.\n
\n If the attribute is not present, the resource is fetched without a CORS request (i.e. without sending the Origin HTTP header), preventing its non-tainted usage. If invalid, it is handled as if the enumerated keyword anonymous was used.\n See CORS settings attributes for additional information.\n
\n For rel=\"stylesheet\" only, the disabled Boolean attribute indicates whether the described stylesheet should be loaded and applied to the document.\n If disabled is specified in the HTML when it is loaded, the stylesheet will not be loaded during page load.\n Instead, the stylesheet will be loaded on-demand, if and when the disabled attribute is changed to false or removed.\n
\n This attribute indicates the language of the linked resource.\n It is purely advisory.\n Allowed values are specified by RFC 5646: Tags for Identifying Languages (also known as BCP 47).\n Use this attribute only if the href attribute is present.\n
For rel=\"preload\" and as=\"image\" only, the imagesizes attribute is a sizes attribute that indicates to preload the appropriate resource used by an img element with corresponding values for its srcset and sizes attributes.
For rel=\"preload\" and as=\"image\" only, the imagesrcset attribute is a sourceset attribute that indicates to preload the appropriate resource used by an img element with corresponding values for its srcset and sizes attributes.
\n This attribute defines the sizes of the icons for visual media contained in the resource.\n It must be present only if the rel contains a value of icon or a non-standard type such as Apple's apple-touch-icon.\n It may have the following values:\n
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