Shadow template is a tool to preview alternate templates or markup without editing the page each time. The link for it shows up in custom tools toolbar of every page. The script also allows to try out different parameters for the same template without editing the page and going through the whole, edit, preview, and save process. This is inspired by, and quite similar in functionality to Template sandbox.


  1. Either choose a template, e.g. "templateBazooka from the drop down or enter a template name in the first input box.
  2. Enter the name of the alternate template to replace e.g. "templateGrenade"
  3. Click preview

The script also allows adding arbitrary markup to the page, once the checkbox is clicked. This can be a template call, e.g.:


It can also be any valid string or wikitext :

{{grenade|throw}}  [[rocket]] bullet


Add this on your wiki:

Global Personal Site-wide
w:Special:Mypage/global.js Special:Mypage/common.js MediaWiki:Common.js

Add this to MediaWiki:ImportJS:

dev:MediaWiki:Shadow template.js
importArticles — Best Practices for installing JavaScript on FANDOM
The importArticles statement is designed to combine multiple HTTP requests into a single data transfer, allowing multiple scripts to load and execute faster. If you've been installing several different scripts, your JavaScript file has probably accumulated unnecessary import statements. Click "Expand" to learn how to efficiently batch import scripts to speed up performance and make your code look cleaner. One other approach is by using the MediaWiki:ImportJS.
If your JavaScript file has several lines of code that say importScript, importScriptPage, or importArticles, you may be able to combine them! By batch importing a collection of scripts with a single import, your JavaScript code will load faster and look cleaner. Consider the example below. On the left is an example of what your JavaScript file might currently look like. On the right is how you could improve that code.
Multiple imports — messy and slow One import — clean and efficient
  type: 'script',
  article: 'u:dev:FloatingToc/code.js'
importScriptPage('page1.js', 'wikiname');
importScriptPage('page2.js', 'wikiname');
    type: 'script',
    articles: [
Note: In this example, pay close attention to the placement of commas and other punctuation. For people who aren't familiar with programming (and even those who are!), a common mistake when writing code is to accidentally delete, forget, or misplace critical symbols like commas or quotation marks. This can cause a syntax error that breaks the code. Carefully follow the convention shown here when using importArticles.
But there's much more to importArticles than just this! For more examples and advanced usage, see the help page at Help:Including additional JavaScript and CSS.

See also