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For Template:Infobox

Sandbox version

including code display

Code used

((((TEMPLATENAME|testcases))/sandbox
 |_template=Infobox
 |_code=include
 |above |image |caption
 |header1 |label2=Custom value (label2) |data2 |label3 |data3
 |header4=''Custom value (header4)''
 |data5 |data6=Custom value ((small|(data6)))
 |below
))

Result

(({above))}
(({image))} (({caption))}
(({header1))}
Custom value (label2)	(({data2))}
(({label3))}	(({data3))}
Custom value (header4)
(({data5))}
Custom value (data6)
(({below))}

Main template

without code display

Code used

((((TEMPLATENAME|testcases))/sandbox
 |_template=Infobox
 |above |image |caption
 |header1 |label2=Custom value (label2) |data2 |label3 |data3
 |header4=''Custom value (header4)''
 |data5 |data6=Custom value ((small|(data6)))
 |below
))

Result

(({above))}
(({image))} (({caption))}
(({header1))}
Custom value (label2)	(({data2))}
(({label3))}	(({data3))}
Custom value (header4)
(({data5))}
Custom value (data6)
(({below))}