| Revision as of 19:15, 3 December 2004 view sourceAltenmann (talk | contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers217,359 editsm Reverted edits by 80.184.109.6 to last version by Pookleblinky← Previous edit | Revision as of 13:25, 8 December 2004 view source Coolcaesar (talk | contribs)Extended confirmed users31,778 edits If you actually read As We May Think word for word, it does not describe hyperlinksNext edit → | ||
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| The ] ] uses ], a measure of ] to determine which page should be ranked first. The more pages that have a hyperlink pointing to a page, the higher rank that page gets. It is actually slightly more complicated than that, see ] for more information. | The ] ] uses ], a measure of ] to determine which page should be ranked first. The more pages that have a hyperlink pointing to a page, the higher rank that page gets. It is actually slightly more complicated than that, see ] for more information. | ||
| ] sued ] under U.S. ] No. 4,873,662 claiming that Prodigy infringed its patent on web hyperlinks. However, after costly ], a ] found for Prodigy, ruling that ] Telecom's patent did not actually cover ] hyperlinks. |
] sued ] under U.S. ] No. 4,873,662 claiming that Prodigy infringed its patent on web hyperlinks. However, after costly ], a ] found for Prodigy, ruling that ] Telecom's patent did not actually cover ] hyperlinks. | ||
| The term "hyperlink" was coined in 1965 (or possibly 1964) by Theodor Nelson at the start of ]. Nelson had been inspired by "]," a popular essay by ]. In the essay, Bush described a microfilm-based machine in which one could link any two pages of information into a "trail" of related information, and then scroll back and forth among pages in a trail as if they were on a single microfilm reel. The closest contemporary analogy would be to build a list of bookmarks to topically related Web pages and then allow the user to scroll forward and backward through the list. | |||
| Nelson transposed Bush's concept of automated cross-referencing into the computer context, made it applicable to specific text strings rather than whole pages, and generalized it from a local desk-sized machine to a theoretical worldwide computer network. Meanwhile, working independently, ] was the first to implement the hyperlink concept for scrolling within a single document (1966), and soon after for connecting between paragraphs within separate documents (1968). See ]. | |||
| While hyperlinking among pages of Internet content has long been considered an ] feature of the Internet ], some websites have claimed that linking to them is not allowed without ], see e.g. and (in Dutch). You do not need to ask permission to link to any page of Misplaced Pages's. | While hyperlinking among pages of Internet content has long been considered an ] feature of the Internet ], some websites have claimed that linking to them is not allowed without ], see e.g. and (in Dutch). You do not need to ask permission to link to any page of Misplaced Pages's. | ||
Revision as of 13:25, 8 December 2004
A hyperlink, or simply a link, is a reference in a hypertext document to another document or other resource. As such it would be similar to a citation in literature. However, combined with a data network and suitable access protocol, it can be used to fetch the resource referenced. This can then be saved, viewed, or displayed as part of the referencing document.
A link has two ends, called anchors, and a direction. The link starts at the source anchor and points to the destination anchor. However, the term link is often used for the source anchor, while the destination anchor is called the link target.
The most common link target is a URL used in the World Wide Web. This can refer to a document, e.g. a webpage, or other resource, or to a position in a webpage. The latter is achieved by means of a HTML element with a "name" or "id" attribute at that position of the HTML document. The URL of the position is the URL of the webpage with "#attribute name" appended.
A web browser usually displays a hyperlink in some distinguishing way, e.g. in a different colour, font or style. A mouse cursor may also change into a hand motif to indicate a link. In most browsers, links are displayed in underlined blue text when not cached, but underlined purple text when cached. When the user activates the link (e.g. by clicking on it with the mouse) the browser will display the target of the link. If the target is not a html-file, depending on the file type and on the browser and its plug-ins, an other program may be activated to open the file.
The HTML code contains some or all of the four main characteristics of a link:
- link target (URL)
- link label
- link title
- link class or link id
It uses the HTML element "a" with the attribute "href" and optionally also the attributes "title", and "class" or "id":
<a href="URL" title="link title" class="link class">link label</a>
When the cursor hovers over a link, depending on the browser, some informative text about the link is shown:
- it pops up, not in a regular window, but in a special hover box, which disappears when the cursor is moved away (sometimes it disappears anyway after a few seconds, and reappears when the cursor is moved away and back). IE and Mozilla Firefox show the title, Opera also shows the URL.
- In addition, the URL may be shown in the status bar. Opera and Mozilla Firefox give the full URL, IE gives it from the last slash, or if it ends with a slash, from the last but one.
The Google search engine uses PageRank, a measure of link popularity to determine which page should be ranked first. The more pages that have a hyperlink pointing to a page, the higher rank that page gets. It is actually slightly more complicated than that, see PageRank for more information.
British Telecom sued Prodigy under U.S. Patent No. 4,873,662 claiming that Prodigy infringed its patent on web hyperlinks. However, after costly litigation, a court found for Prodigy, ruling that British Telecom's patent did not actually cover web hyperlinks.
The term "hyperlink" was coined in 1965 (or possibly 1964) by Theodor Nelson at the start of Project Xanadu. Nelson had been inspired by "As We May Think," a popular essay by Vannevar Bush. In the essay, Bush described a microfilm-based machine in which one could link any two pages of information into a "trail" of related information, and then scroll back and forth among pages in a trail as if they were on a single microfilm reel. The closest contemporary analogy would be to build a list of bookmarks to topically related Web pages and then allow the user to scroll forward and backward through the list.
Nelson transposed Bush's concept of automated cross-referencing into the computer context, made it applicable to specific text strings rather than whole pages, and generalized it from a local desk-sized machine to a theoretical worldwide computer network. Meanwhile, working independently, Douglas Engelbart was the first to implement the hyperlink concept for scrolling within a single document (1966), and soon after for connecting between paragraphs within separate documents (1968). See NLS.
While hyperlinking among pages of Internet content has long been considered an intrinsic feature of the Internet medium, some websites have claimed that linking to them is not allowed without permission, see e.g. and (in Dutch). You do not need to ask permission to link to any page of Misplaced Pages's.
See also deep linking.
Legal aspect
In some jurisdictions it is or was (for example the Netherlands, see Karin Spaink) held that hyperlinks are not merely references or citations, but are devices for copying web pages. Although this principle is generally rejected by digerati , the courts that adhere to it see the mere publication of a hyperlink that connects to illegal material to be an illegal act in itself, regardless of whether referencing illegal material is illegal.
External links
- Links & Law - case law summary, links to relevant court rulings worldwide and to relevant articles about hyperlinking