Template:Template link expanded
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This template provides a link to a template with a given name, but in code instead of as plain text. As a second unnamed parameter, plaincode can be passed in to remove the styling around the resulting text, while nolink will prevent linking to the template in question when it is not necessary.
You can input a "magic word" as the first unnamed parameter to link to MediaWiki's help page for magic words. Passing in ! or = will link to the section about escaped characters, since {{!}} and {{=}} are "magic words" as well.
Note: You can use {{tlx}} as a shortcut.