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There are many ways to use Ref and Note. Among the simplest is: {| border="1" style="border:1px solid #AAA; border-collapse:collapse; width:80%;" ! style="background:#00308F;" |Article ! style="background:#00308F;" |Wikitext Text that requires a footnote.

Alternatives
You can also consider using the  and   tags instead like this: {| border="1" style="border:1px solid #AAA; border-collapse:collapse; width:80%;" ! style="background:#00308F;" |Article ! style="background:#00308F;" |Wikitext Text that requires a footnote.

More text that requires a footnote.