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{{{{SITENAME}}/Help}}
On this web site, text markup can be accomplished both by using "wikimarkup" and by using '''tags'''. 

[http://meta.wikimedia.org/wiki/Help:Editing Wikimarkup] is designed to be easy to read and to write and is generally to be preferred over more complex alternatives.
Sometimes, however, HTML or similar special-purpose tags are needed, for example for footnotes and complex mathematical formulae.

==Basic Tags==
To specify that some text is to be processed in a special way, the text is enclosed by a start tag and an end tag, as illustrated by the following line using a fictitious label "tagName":

 <nowiki><tagName>Some text to be processed</tagName></nowiki>

For example:

{{pre|width=800|Content creation should not be recondite.&lt;ref>Brendan Eich, ''Innovators of the Net.''&lt;/ref>}}

If the sole purpose of a tag is to provide a directive, a single tag of the form <tagName/> may be specified. For example, to signal the position of all pending footnotes, one might write:

<pre>
 ==Footnotes==
 <references/>
</pre>

==HTML Tags==
The use of unrestricted HTML raises certain privacy and security issues and a distinction is therefore drawn
between "safe" and "potentially unsafe" HTML:

* "Safe" HTML can be used in an unrestricted way.  A list of safe HTML tags is provided [http://meta.wikimedia.org/wiki/Help:HTML_in_wikitext here].

* "Unsafe" HTML must be enclosed within an "html" tag as illustrated in the following:

{{pre|<nowiki>&lt;html><script>alert("Hello")</script></html></nowiki>}}


This allows the {{SITENAME}} administrators to disable the processing of unsafe HTML should security considerations so require.

==Special-Purpose Tags==

The list of special-purpose tags that are available on {{SITENAME}} is growing over time as additional modules are added.
Here is the current list:

{| border=1 cellpadding=4 id=tags
! Tag
! Further Details
! Comment
|-
| <nowiki><nowiki></nowiki> ||[http://meta.wikimedia.org/wiki/Help:Editing#Just_show_what_I_typed] || Wiki markup between the nowiki start and end tags is left as-is
|-
| <nowiki><categorytree></nowiki> || [[Help:CategoryTree|CategoryTree]] || AJAX-based browser of category hierarchy
|-
| <nowiki><ref></nowiki> ||[[Help:Cite|Cite]] || Create a footnote
|-
| <nowiki><references></nowiki> ||[[Help:Cite|Cite]] || Insert pending footnotes
|-
| <nowiki><gallery></nowiki> || [[Help:Gallery|Gallery]] || Create a gallery of images
|-
| <nowiki><gnuplot></nowiki> || [[Help:Gnuplot|Gnuplot]] || Works with inline or uploaded data
|-
| <nowiki><math></nowiki> || [[Help:Math|Math]] || TeX markup for mathematical formulae
|-
| <nowiki><googlemap></nowiki> || [[Help:Googlemap|Googlemap]] || Embed a [[Help:Google Maps|Google Map]]
|-
| <nowiki><googlevideo></nowiki> || [[Help:Video|Video]] || Embed a [http://video.google.com Google video] using Flash.
|-
| <nowiki><graphviz></nowiki> || [[Graphviz]] || Markup for generating graphs with hot spots defined as hyperlinks
|-
| <nowiki><calendar></nowiki> || [[Help:Calendar|Calendar]] || Calendar with hyperlinks and support for a [[wikipedia:iframe|iframe]]s.
|-
| <nowiki><flash></nowiki> || [[{{SITENAME}}:Flash]] || View uploaded .swf Flash files
|-
| <nowiki><gflash></nowiki> || [[{{SITENAME}}:Gflash]] || View .swf Flash files using an http: URL
|-
| <nowiki><flyover></nowiki> || [[Help:flyover|flyover]] || Flyover images (images that appear when the cursor hovers over a 
<flyover src="http://qed.princeton.edu/images/8/8c/Acid_Rain_in_Europe,_1993.png" MAX=500>hotspot</flyover>)
|-
| <nowiki><image></nowiki> || [[{{SITENAME}}:image]] || a single tag for both internal and external images
|-
| <nowiki><jmol></nowiki> || [[Help:Jmol|Jmol]] || view 3D images of molecules interactively and stereoscopically
|-
| <nowiki><kmz></nowiki> || [[{{SITENAME}}:KMZ]] || a tag for use with [[Help:Google Earth|Google Earth]] and [[Help:Google Maps|Google Maps]]
|-
| <nowiki><memorize></nowiki> || [[Help:Memorize|Memorize]] || Create an interactive flashcard quiz or memory game.
|-
| <nowiki><mov></nowiki> || [[Help:mov|mov]] || Embed QuickTime video
|-
| <nowiki><ram></nowiki> || [[Help:ram|ram]] || Embed RealMedia video
|-
| <nowiki><sharethis></nowiki> || [[Help:Share this|Share this]] || <sharethis/>
|-
| <nowiki><DPL></nowiki> || [[{{SITENAME}}:Dynamic Page List]] || A simple query language for finding {{SITENAME}} pages matching namespace/category criteria
|-
| <nowiki><ListSubPages></nowiki> || [[{{SITENAME}}:List Subpages]] || List the subpages of a top-level page. Use [[:Template:ls]] 
|-
|}

In addition, the following tags are currently supported but may be temporarily disabled if security considerations so require:
* the <nowiki><javascript></nowiki> tag for executing Javascript &mdash; see [[Help:Javascript]];
* the <nowiki><php></nowiki> tag for executing [[wikipedia:PHP|PHP]]{{wp}} (currently restricted to '''protected''' pages) &mdash; see [[phpinfo]] for an example.

==Tags in Templates==
To define a [[Help:template|template]] using a tag containing template variables, the '''[[Help:macro|#macro]]''' parser function should be used.

==See also==
* [[Help:Video]]
* [[Help:Templates]]
* [[JpGraph]]
Templates used on this page:
Return to Help:Tags.
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