From https://www.mediawiki.org/wiki/Extension:TemplateSandbox
> The TemplateSandbox extension adds the ability to preview a page using sandboxed versions of templates, allowing for easy testing before making the sandbox code live. It also works with Scribunto modules.
From https://www.mediawiki.org/wiki/Suggestions_for_extensions_to_be_integrated#TemplateSandbox
> Can see how a template will really show up. Should be useful for lots of wikis. -- Prod (talk) 17:23, 20 April 2013 (UTC)
>
> Support MacFan4000 (talk) 23:19, 24 July 2017 (UTC)
> Neutral Neutral I believe most non-Wikimedia wikis may not find this that useful. Hence bundling with the installed may not be a good idea. Rehman 05:48, 9 August 2020 (UTC)
> Support * Pppery * it has begun 15:54, 17 August 2024 (UTC)
> Support I believe this is definitely useful for people who like templating content easily. Aeyeu (talk) 03:20, 20 April 2025 (UTC)
**Checklist:**
[ ] Passed discussion or already Wikimedia deployed
[ ] Passed security review or already Wikimedia deployed
[ ] Voting CI structure tests
[ ] Runs MediaWiki-CodeSniffer
[ ] Runs phan
[ ] Supports MySQL, SQLite, and Postgres (if there are schema changes)
[ ] GPL v2 or later compatible license
[ ] Extension's default configuration provides optimal experience
[ ] Tested with web installer
[ ] Any relevant dependencies also bundled