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A template is a Wikipedia page created to be included in other pages. It usually contains repetitive material that may need to show up on multiple articles or pages, often with customizable input. Templates sometimes use MediaWiki parser functions, nicknamed "magic words", a simple scripting language. Template pages are found in the template ...
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This template internally uses mw:Extension:SyntaxHighlight, which is considered an 'expensive parser function' (see WP:EXPENSIVE). If used on a page which uses more than 500 expensive parser functions, the output of subsequent uses of this template will be presented using <code>...</code> formatting (without any syntax highlighting) instead.
This template can take any number of unnamed parameters as parameters accompanying the template link (or name); see Examples below. Examples Use the displayed value in the code column, not the underlying source code.
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 ...
(For example, the script with the code <code>Semap</code> has the name <code>"flag semaphore"</code>, which should remain lowercase when used as part of the category name [[:Category:Translingual letters in flag semaphore]] but should be capitalized in [[:Category:Flag semaphore templates]].)
Most templates allow authors to override the default text in this way, some require text put after the template call and some also need a vertical bar in between: {{table cell template}} text or {{table cell template}} | text. This information, the colors and default texts are found in the table below.
Try carefully proofreading troublesome code, matching "{{" with "}}". (consider using Equazcion's syntax highlighter for Notepad++) Copy a template section into a test-page edit-window, for debug. Copy a template section to the top of the template, for debug. Restructure a template so that each section is more separated.