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When then viewing the page, {{foo}} is automatically replaced by the content of the page "Template:foo". If the page "Template:foo" is later altered, all the pages with {{foo}} in them will change automatically. Among other things, templates are used to add recurring messages to pages in a consistent way, to add boilerplate messages, and to ...
English: A complete beginner's guide to editing Wikipedia using the visual editor to add information, add a reference source in a citation, and then add an edit summary and save. Date 9 March 2018
Before doing changes to a template it can be good to first copy the template code to a sandbox and run some testcases, since the template might be visible on thousands or even millions of pages. If you create subpages named exactly " /sandbox " and " /testcases " to a template then the green {{documentation}} box on the template auto-detects ...