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A canonical link element is an HTML element that helps webmasters prevent duplicate content issues in search engine optimization by specifying the "canonical" or "preferred" version of a web page. It is described in RFC 6596, which went live in April 2012.
It must be unique on the page. This can be used as another #link target, and could have other metadata uses. By default, the |term= a.k.a. |1= parameter is already set as the ID, and this should rarely be overridden, unless there are two identical terms on the same page creating conflicting IDs.
A list-defined reference has a conflicting group attribute "$1" (see the help page). A list-defined reference named "$1" is not used in the content (see the help page). A list-defined reference has no name (see the help page). The named reference "$1" was defined multiple times with different content (see the help page).
If you have read this help page and find something missing or confusing, please discuss it at the main talk page. Please reference this page and the page where you have the problem so we can understand your issues. For basic information on the footnotes system, see Referencing for beginners; for advanced help, see Footnotes.
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
In the visual editor, such a template can be created using Insert > Template > Main, and then setting the 'Page 1' parameter equal to the page to be referred to. The 'Label 1' parameter may optionally be used to set the text the link is displayed as. Up to five of these links may be specified. In the source editor, the code {{Main|page1|page2 ...
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An example of hidden comments This won't be visible except in "edit" mode. --> Another way to include a comment in the wiki markup uses the {} template, which can be abbreviated as {}. This template "expands" to the empty string, generating no HTML output; it is visible only to people editing the wiki source.