Indicates to an application the intended behavior for a link, specifically, the timing for obtaining or retrieving the content of a link (for example, by a user clicking on the link to request the material, or by the material being automatically loaded with a document when the document or document component is loaded).
|none||The behavior is unconstrained, and no other markup is generally available in the link to assist an application in deducing the retrieval mechanism.|
|onLoad||An application should retrieve the link at the same time a user obtains the initial document.|
|onRequest||An application should only retrieve the link after a user has physically triggered the retrieval, for example, clicked on the link.|
|other||The behavior is unconstrained, but other markup is generally available in the link to assist an application in deducing the retrieval mechanism.|
|Restriction: This attribute may be specified if the element is used.|