Testing sandbox version

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{{Self-reference/sandbox}}

Code
{{Self-seference/sandbox|This self-reference concerns [[Wikipedia]]}}
{{Self-reference/sandbox|This self-reference concerns [[Wikipedia]]|inline}}
Produces

This self-reference concerns Wikipedia

Testing main template

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{{Self-reference}}

Code
{{Self-reference|This self-reference concerns [[Wikipedia]]}}
{{Self-reference|This self-reference concerns [[Wikipedia]]|inline}}
Produces