The form that appears below the edit window when editing a template with the TemplateSandbox extension enabled does not have any pointer to the TemplateSandbox documentation.
This is problematic as there's no explanation of what the box is, how it works, etc. It just says:
Preview page with this template
Page title: [_________________________] [Show preview]
Some kind of "what is this?" feature is needed, at least for now, I think. I tried to request that the "Preview page with this template" MediaWiki message be changed to include a "what's this?" link, but the message is not parsed (cf. https://en.wikipedia.org/w/index.php?title=MediaWiki_talk:Templatesandbox-editform-legend&oldid=529062236#Add_pointer_to_docs). I'm not sure why this is.
The message should either be parsed and/or there should be a pointer to the TemplateSandbox documentation from the input area below the edit window. The "Usage" section of the template's documentation is good, it's just impossible to figure out how to find that page on mediawiki.org (https://www.mediawiki.org/wiki/Extension:TemplateSandbox) from the edit window.
Version: unspecified
Severity: enhancement