Editing Help:Transclusion (section)

===Pages with a common section===
{{shortcut|WP:COMMONSECTION}}
When two pages need to discuss the same material in the same way, they can share a section. For example, a section of an existing page may be transcluded to other pages. This may also involve creating a third page and transcluding that page onto both pages. This third page may be a standalone page in its own right for another purpose, or a subpage of either of the other two – except in the mainspace, where [[Wikipedia:Subpages|subpages are not allowed]]. The third page may be placed in the same namespace as the other pages or in template namespace – again, except for use in mainspace, where templates should not be used to store [[Wikipedia:What is an article?|article text]], as this makes it more difficult to edit the content (see [[WP:TG]]). Common sections like this should be marked with an explanatory header, such as using the templates {{Tl|Transcluding article}} or {{Tl|Transcluded section}} to create [[Wikipedia:Hatnote|hatnotes]] above the transcluded content, and/or given a special layout, to inform the reader that this section of the page is in a different location, since transcluding shared article sections can easily confuse novice editors and readers alike if left unmarked. All templates can be found at [[:Category:Transclude page content templates]].

This can be very useful when two [[WP:DAB|disambiguation]] pages share content,{{Disputed inline|talk=Wikipedia talk:Manual of Style/Disambiguation pages#Transclusion|date=September 2017}} or a [[Wikipedia:List|list page]] and a disambiguation page share content (see third example below).

Examples:
*The [[Help:Editing sections of included templates]] article is included in [[Help:Section]] with the markup <syntaxhighlight lang="wikitext" inline>{{Help:Editing sections of included templates}}</syntaxhighlight>. By including a heading in the included article, a user clicking the "Edit" link on that heading in [[Help:Section]] is automatically directed to edit [[Help:Editing sections of included templates]].
*{{pim|Help|Alphabetic order}}
* [[Joseph Gordon-Levitt]] transcludes the introduction of [[HitRecord]] into a summary section of the same name, rather than maintaining two copies of the identical text.