Include control

Three tags control what appears when a template is transcluded versus when its own page is viewed directly:

Tag	On the template's own page	When transcluded
<noinclude>…</noinclude>	shown	removed
<includeonly>…</includeonly>	removed	shown
<onlyinclude>…</onlyinclude>	shown	only this is transcluded

• <noinclude> — documentation, examples, or notes that belong on the template page but shouldn't appear everywhere the template is used.
• <includeonly> — content that should appear only at the call sites, never on the template's own page.
• <onlyinclude> — the strongest: when present, only the wrapped section(s) get transcluded and everything else is ignored for transclusion (it overrides the others).

Example

<onlyinclude>{{{1}}} — the reusable part</onlyinclude>
<noinclude>
== Usage ==
Documentation and examples, visible only on this template page.
</noinclude>