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==Usage==
Wraps a short span of text in <code><nowiki><syntaxhighlight></nowiki></code> tags (see [[mw:Extension:SyntaxHighlight GeSHi]]).  This template should be used for short samples; longer content should use {{tag|pre}} or {{tag|syntaxhighlight}}. See [[Help:Wiki markup]] for an explanation of what the various tags do.{{clarify|reason=[[Help:Wiki markup]] does not mention any such "source" XML tag.}}

If the content includes an equals sign (=), you must specify the parameter explicitly: <code><nowiki>{{code|1=date=30 Feb 2010}}</nowiki></code>.

The template uses the <code><nowiki><syntaxhighlight></nowiki></code> tag with the attribute <code>enclose="none"</code>. This works like the combination of the <code><nowiki><code></nowiki></code> and <code><nowiki><nowiki></nowiki></code> tags, applied to the expanded wikitext. For example, <code><nowiki>{{code|some '''wiki''' text}}</nowiki></code> will '''''not''''' render the word "wiki" in bold, and will render the tripled-single-quotes:

:{{code|some '''wiki''' text}}

However, <code><nowiki>{{code|a {{template}} call}}</nowiki></code> will still invoke the template:

:{{code|a {{template}} call}}

Use {{tag|nowiki}} around the template name to avoid this problem:

:{{code|a <nowiki>{{template}}</nowiki> call}}

When used inline with regular text, {{tnull|code}} generally looks best and is easiest to read when it is explicitly spaced apart from the regular text:
:{{code|foo &nbsp;<nowiki>{{code|bar baz}}</nowiki>&nbsp; quux.}}
is well spaced:
:foo &nbsp;{{code|bar baz}}&nbsp; quux.
versus:
:{{code|foo <nowiki>{{code|bar baz}}</nowiki> quux.}}
which is going to be visually confusing for many:
:foo {{code|bar baz}} quux.
because "foo" and "{{code|bar}}" will seem more closely associated than "{{code|bar}}" and "{{code|baz}}"; the width of the space character in a monospaced font is almost always larger than in a proportional font.

Use parameter {{{2}}} (unnamed, as {{para|2}}, or more explicitly as {{para|lang}}) to specify a language for Extension:SyntaxHighlight GeSHi. This option defaults to plain-text, i.e. no highlighting.  There is no highlighting option for wikitext as a markup language, though {{code|html4strict}} and {{code|html5}} are valid values, as are {{code|php}}, {{code|perl}}, {{code|css}}, {{code|javascript}}, {{code|mysql}} and many others. Attempting to use an invalid one causes a list of valid ones to be displayed in place of the template output, when the page is previewed or saved.

This template does not need to be [[Wikipedia:Template substitution|substituted]].

Finally, embedded templates do not function inside {{tnull|code}}; for longer, free-form blocks of code, which can contain templates such as {{tlx|var}} and {{tlx|samp}}, use {{tag|code}} as a wrapper instead of this template.

===Examples===
{| class="wikitable"
! style="width:50%;" | input
! style="width:50%;" | output
|-
| <pre style="margin:0px; white-space:normal;">Lorem {{code|ipsum '''dolor'''}} sit amet</pre>
| Lorem {{code|ipsum '''dolor'''}} sit amet
|-
| <pre style="margin:0px; white-space:normal;">The declaration {{code |lang=cpp |int foo(const std::string& bar, const std::vector<long double*>& baz);}} is the prototype for a function defined later.</pre> 
| The declaration {{code |lang=cpp |int foo(const std::string& bar, const std::vector<long double*>& baz);}} is the prototype for a function defined later.
|-
| <pre style="margin:0px; white-space:normal;">If the code contains an [[equals sign]], such as {{code |lang=javascript |code=var img = document.getElementsByTagName("img");}}, you must identify the first parameter explicitly as {{{1}}} or {{{code}}}; see also [[:bugzilla:5138]].</pre> 
| If the code contains an [[equals sign]], such as {{code |lang=javascript |code=var img = document.getElementsByTagName("img");}}, you must identify the first parameter explicitly as {{{1}}} or {{{code}}}; see also [[:bugzilla:5138]].
|}

== See also ==
* {{tl|nowiki}} - for preventing the parsing of wiki markup and HTML in the content, e.g. in source code examples
* {{tl|pre}} - for larger blocks of source code and other pre-formatted text
* {{tl|tag}} - for using HTML elements ("tags") in prose, e.g. source code examples
* {{tl|var}} - for computer and mathematics variables
* {{tl|varserif}} - same as {{tnull|var}} but differentiates better between "I" (upper-case "i") and "l" (lower-case "L")
* {{tl|kbd}} - for indicating user input
* {{tl|samp}} - for example output
* {{tl|key press}} - for indicating the input of specific keystrokes, e.g. {{key press|Ctrl|X}}
* [[Help:Wiki markup]]

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