Looking to learn something new? Both are coming from our sidebar. Why are the attributes different? Montalvo Miguelo 24, Points.
Montalvo Miguelo Montalvo Miguelo 24, Points. Floyd Orr 11, Points. Floyd Orr Floyd Orr 11, Points. It's all a bit over my head as of yet, but I think I got that. Find centralized, trusted content and collaborate around the technologies you use most. Connect and share knowledge within a single location that is structured and easy to search. So what is the function of each of these attributes and when to use each one of them. Resourse pointed by src attribute is linked to the current document such as img, video, audio, or script.
The browser will allocate screen real estate depending upon the physical dimensions of the embedded object. In fact, you can define several alternative styles, although the main issue with this approach lies in making it clear to the user that an alternative style sheet is available. The following markup shows a page that has one main style sheet and two alternatives:. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
All Rights Reserved. W3Schools is Powered by W3. Provides a link to an alternate version of the document i. Specifies that the browser should preemptively perform DNS resolution for the target resource's origin. Provides a link to a help document. Imports an icon to represent the document. 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.
You can also specify alternative style sheets. This provides a way for users to see multiple versions of a page. You can include links to several different icons on the same page, and the browser will choose which one works best for its particular context using the rel and sizes values as hints.
You can provide a media type or query inside a media attribute; this resource will then only be loaded if the media condition is true. 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:. Note: The load event fires once the stylesheet and all of its imported content has been loaded and parsed, and immediately before the styles start being applied to the content.
Note: In HTML 4, this can only be a simple white-space-separated list of media description literals, i. Browsers not supporting CSS3 Media Queries won't necessarily recognize the adequate link; do not forget to set fallback links, the restricted set of media queries defined in HTML 4.
Content categories Metadata content. If itemprop is present: Flow content and phrasing content. Permitted content None, it is an empty element. Tag omission As it is a void element, the start tag must be present and the end tag must not be present Permitted parents Any element that accepts metadata elements. If itemprop is present: any element that accepts phrasing content. Link HTTP header. Metadata content. Any element that accepts metadata elements.
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