: Create MediaWiki template to format source code I want to create a MediaWiki template like <syntaxhighlight lang="Java" style="background-color:lightgray; border:1px dashed gray;"> {{{code}}} </syntaxhighlight>

@Angela700

The problem is that code inside “extension tags” like <syntaxhighlight> is not parsed, which is why the {{{code}}} is not replaced with the value of the code parameter.

What you need to use is to use {{#tag}} parser function:

{{#tag:syntaxhighlight|{{{code}}}|lang=java|style=background-color:lightgray; border:1px dashed gray;}}

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@Rivera981

Yes, you can do that with <includeonly> tags, like so: (custom styles removed for clarity)

<includeonly><syntaxhighlight lang="Java"></includeonly>
{{{code}}}
<includeonly></syntaxhighlight></includeonly>


From mediawiki.org:


The markup <includeonly>...</includeonly> means that the text between the tags will only be used when the page is transcluded onto another page, and will not appear on the page itself.


So basically the <syntaxhighlight> tags are ignored on the template page, fooling the parser into highlighting code parameter when it is transcluded on another page.

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