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| Inline link | |
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An inline link displays remote content without the need for embedding the content. The remote content may be accessed with or without the user selecting the link. For example, the image above is a document that can be viewed separately, but it is included into this page with an inline link.
An inline link may display a modified version of the content; for instance, instead of an image, a thumbnail, low resolution preview, cropped section, or magnified section may be shown. The full content will then usually be available on demand, as is the case with print publishing software – e.g. with an external link. This allows for smaller file sizes and quicker response to changes when the full linked content is not needed, as is the case when rearranging a page layout.
[edit] Tags:Inline Link,Thumbnail,Low Resolution,Preview,Cropped,Magnified,Print Publishing,Page Layout,User,Ie, | |
| Anchor | |
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An anchor hyperlink is a link bound to a portion of a document—generally text, though not necessarily. For instance, it may also be a hot area in an image (image map in HTML), a designated, often irregular part of an image. One way to define it is by a list of coordinates that indicate its boundaries. For example, a political map of Africa may have each country hyperlinked to further information about that country. A separate invisible hot area interface allows for swapping skins or labels within the linked hot areas without repetitive embedding of links in the various skin elements.
[edit] Tags:Image Map,Skins,Html,Label, | |
| Hyperlinks in HTML | |
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Tim Berners-Lee saw the possibility of using hyperlinks to link any information to any other information over the Internet. Hyperlinks were therefore integral to the creation of the World Wide Web. Web pages are written in the hypertext mark-up language HTML.
Links are specified in HTML using the <a> (anchor) elements. To see the HTML used to create a page, most browsers offer a "view page source" option. Included in the HTML code will be an expression in the form symbol "<a" and the reference "href="URL">" marking the start of an anchor, followed by the highlighted text and the "</a>" symbol, which indicates the end of the source anchor. The <a> element can also be used to indicate the target of a link.
Webgraph is a graph, formed from web pages as vertices and hyperlinks, as directed edges.
[edit] Tags:Reference,World Wide Web,<a> (anchor),Webgraph,Graph,Url,Web,Internet, | |
| XLink: hyperlinks in XML | |
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Main article: XLink
The W3C Recommendation called XLink describes hyperlinks that offer a far greater degree of functionality than those offered in HTML. These extended links can be multidirectional, linking from, within, and between XML documents. It also describes simple links, which are unidirectional and therefore offer no more functionality than hyperlinks in HTML.
[edit] Tags:Xlink,W3c,Documents, | |
| Hyperlinks in other document technologies | |
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Hyperlinks are used in the Gopher protocol, text editors, PDF documents, help systems such as Windows Help, word processing documents, spreadsheets, Apple's HyperCard and many other places.
[edit] Tags:Gopher Protocol,Text Editors,Pdf Documents,Windows Help,Word Processing,Spreadsheets,Apple,Hypercard,Window,Windows, | |
| Hyperlinks in virtual worlds | |
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Main article: Hyperlinks in virtual worlds
Hyperlinks are being implemented in various 3D virtual world networks, including those which utilize the OpenSimulator[2] and Open Cobalt[3] platforms.
[edit] Tags:Virtual World,Opensimulator,Open Cobalt, | |
| Hyperlinks in wikis | |
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While wikis may use HML-type hyperlinks, lightweight markup languages of wikis (wiki markup) provide simplified syntax, called wikilinks for linking pages within wiki environments.
The syntax and appearance of wikilinks may vary. Ward Cunningham's original wiki software, the WikiWikiWeb, used CamelCase for this purpose. CamelCase was also used in the early version of Wikipedia and is still used in some wikis, such as JSPWiki, TiddlyWiki, Trac and PMWiki. A common markup is using double square brackets around the term to be wikilinked, for example, the following input: [[wiki software]] — will be converted by wiki software to look like this: wiki software.
Hyperlinks used in wikis are commonly classified as follows:
Internal wikilinks or intrawiki links lead to pages within the same wiki website.
Interwiki links are simplified markup hyperlinks lead to pages of other wikis.
External links lead to other webpages.
If an internal wikilink leads to a page that does not exist, it usually has a distinct visual appearance. For example, in Wikipedia they are commonly displayed in red color, like this, and therefore they are called red links in Wikipedia.[4] Another way is to display a highlighted clickable question mark by the wikilinked term, like this?.
[edit] Tags:Lightweight Markup Languages,Wiki Markup,Ward Cunningham,Wiki Software,Wikiwikiweb,Camelcase,Wikipedia,Jspwiki,Tiddlywiki,Trac,Pmwiki,Like This,?,Webpage,Color, | |
| How hyperlinks work in HTML | |
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A link from one domain to another is said to be outbound from its source anchor and inbound to its target.
The most common destination anchor 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 an 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 a fragment identifier — "#attribute name" — appended.
When linking to PDF documents from an HTML page the "attribute name" can be replaced with syntax that references a page number or another element of the PDF, for example, page=[pageNo] – "#page=386".
[edit] Tags:Html Element,References, | |
| Link behavior in web browsers | |
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A web browser usually displays a hyperlink in some distinguishing way, e.g. in a different color, font or style. The behavior and style of links can be specified using the Cascading Style Sheets (CSS) language. In a graphical user interface, the appearance of a pointer may change into a hand motif to indicate a link. In most graphical web 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 an HTML file, depending on the file type and on the browser and its plugins, another program may be activated to open the file. The HTML code contains some or all of the five main characteristics of a link: *link destination ("href" pointing to a URL) *link label *link title *link target *link class or link id It uses the HTML element "a" with the attribute "href" (HREF is an abbreviation for "Hypertext REFerence"[5]) and optionally also the attributes "title", "target", and "class" or "id": :<a href="URL" title="link title" target="link target" class="link class">link label</a> Example: To embed a link into a Page, blogpost, or comment, it may take this form: :<a href="http://example.com/">Example</a> After publishing, the complex link string is reduced to the following for visualization in typical Web browsers: Example This contributes to a clean, easy to read text or document. When the pointer hovers over a link, depending on the browser and/or graphical user interface, some informative text about the link can be shown, popping up, not in a regular window, but in a special hover box, which disappears when the pointer is moved away (sometimes it disappears anyway after a few seconds, and reappears when the pointer is moved away and back). Mozilla Firefox, IE, Opera, and many other web browsers all show the URL. In addition, the URL is commonly shown in the status bar. Normally, a link will open in the current frame or window, but sites that use frames and multiple windows for navigation can add a special "target" attribute to specify where the link will be loaded. If no window exists with that name, a new window will be created with the ID, which can be used to refer to the window later in the browsing session. Some developers may choose to capitalize links, to reflect server side interaction such as forms, or abbreviations. Capitalizing is OKAY. Creation of new windows is probably the most common use of the "target" attribute. In order to prevent accidental reuse of a window, the special window names "_blank" and "_new" are usually available, and will always cause a new window to be created. It is especially common to see this type of link when one large website links to an external page. The intention in that case is to ensure that the person browsing is aware that there is no endorsement of the site being linked to by the site that was linked from. However, the attribute is sometimes overused and can sometimes cause many windows to be created even while browsing a single site. Another special page name is "_top", which causes any frames in the current window to be cleared away so that browsing can continue in the full window.
[edit] Tags:Font,Style,Cascading Style Sheets,Pointer,Hand,Cached,File Type,Plugins,Link Label,Hover,Mozilla Firefox,Opera,Status Bar,Frame, | |
| History of the hyperlink | |
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Douglas Engelbart and his team at SRI, 1969
The term "hyperlink" was coined in 1965 (or possibly 1964) by Ted 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 (the Memex) 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.
In a series of books and articles published from 1964 through 1980, Nelson transposed Bush's concept of automated cross-referencing into the computer context, made it applicable to specific text strings rather than whole pages, generalized it from a local desk-sized machine to a theoretical worldwide computer network, and advocated the creation of such a network. Meanwhile, working independently, a team led by Douglas Engelbart (with Jeff Rulifson as chief programmer) 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), with NLS.
A database program HyperCard was released in 1987 for the Apple Macintosh that allowed hyperlinking between various types of pages within a document.
[edit] Tags:Ted Nelson,Project Xanadu,As We May Think,Vannevar Bush,Memex,Douglas Engelbart,Jeff Rulifson,Nls, | |
| Legal issues | |
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Main article: Copyright aspects of hyperlinking and framing
While hyperlinking among webpages is an intrinsic feature of the web, some websites object to being linked to from other websites; some have claimed that linking to them is not allowed without permission.
Contentious in particular are deep links, which do not point to a site's home page or other entry point designated by the site owner, but to content elsewhere, allowing the user to bypass the site's own designated flow, and inline links, which incorporate the content in question into the pages of the linking site, making it seem part of the linking site's own content unless an explicit attribution is added.
In certain jurisdictions it is or has been held that hyperlinks are not merely references or citations, but are devices for copying web pages. In the Netherlands, Karin Spaink was initially convicted in this way of copyright infringement by linking, although this ruling was overturned in 2003. The courts that advocate this view 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. In 2004, Josephine Ho was acquitted of 'hyperlinks that corrupt traditional values' in Taiwan.[6]
In 2000 British Telecom sued Prodigy, claiming that Prodigy infringed its patent (U.S. Patent 4,873,662) on web hyperlinks. After litigation, a court found for Prodigy, ruling that British Telecom's patent did not cover web hyperlinks.[7]
In United States jurisprudence, there is a distinction between the mere act of linking to someone else's website, and linking to content that is illegal or infringing.[8] Several courts have found that merely linking to someone else's website is not copyright or trademark infringement, regardless of how much someone else might object.[9][10][11] Linking to illegal or infringing content can be sufficiently problematic to give rise to legal liability.[12][13][14][15][16] For a summary of the current status of US copyright law as to hyperlinking, see this discussion.
[edit] Tags:Deep Links,Home Page,Citations,Karin Spaink,Taiwan,British Telecom,Litigation,Court,United States,Jurisprudence,Infringing, | |
| See also | |
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Dead link
Internal link
Methods of website linking
Object hyperlinking
PageRank
Xenu's Link Sleuth
[edit] Tags:Dead Link,Internal Link,Methods Of Website Linking,Pagerank,Xenu's Link Sleuth, | |
| References | |
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^ Merriam-Webster.com, hyperlink
^ Hypergrid
^ Creating, Saving, and Loading Spaces
^ Wikipedia: the missing manual By John Broughton, 2008, ISBN 0596515162, p. 75
^ Tim Berners-Lee, Making a Server ("HREF" is for "hypertext reference")
^ The prosecution of Taiwan sexuality researcher and activist Josephine Ho
^ CNET News.com, Hyperlink patent case fails to click. August 23, 2002.
^ Cybertelecom:: Legal to Link?[dead link]
^ Ford Motor Company v. 2600 Enterprises, 177 F.Supp.2d 611 (EDMi December 20, 2001)
^ American Civil Liberties Union v. Miller, 977 F.Supp. 1228 (ND Ga. 1997)
^ Ticketmaster Corp. v. Tickets.Com, Inc., No. 99-07654 (CD Calif. March 27, 2000)
^ Intellectual Reserve v. Utah Lighthouse Ministry, Inc., 75 FSupp2d 1290 (D Utah 1999)
^ Universal City Studios Inc v Reimerdes, 111 FSupp2d 294 (DCNY 2000)
^ Comcast of Illinois X LLC v. Hightech Elec. Inc., District Court for the Northern District of Illinois, Decision of July 28, 2004, 03 C 3231
^ WebTVWire.com, Linking to Infringing Video is probably Illegal in the US. December 10, 2006.
^ Compare Perfect 10 v. Google, Decision of February 21, 2006, Case No. CV 04-9484 AHM (CD Cal. 2/21/06), CRI 2006, 76–88 No liability for thumbnail links to infringing content
[edit] Tags: | |
| Further reading | |
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Weinreich, Harald; Hartmut Obendorf, Winfried Lamersdorf (2001). The look of the link – concepts for the user interface of extended hyperlinks. p. 19. doi:10.1145/504216.504225. http://portal.acm.org/citation.cfm?id=504225. Retrieved 2010-09-04.
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