I add line numbers to Lua modules with JS & CSS.
An improvement to the Cargo pagevalues view using just JS & CSS.
Let's make a gadget so that Alt+Shift+E creates a new page from the Special:Search screen when a page doesn't exist!
A small JS gadget to disable display title for wiki editors
Here's how I've built a framework for both static and lazily-loaded popups.
Disambiguations are typically somewhat user-unfriendly; I describe my method for improving quality of life when disambiguation links do appear.
CharInsert is one of my favorite extensions. Here's how I made a Lua wrapper for it to create a user-friendly interface for anyone to add snippets they want.
The Gadgets extension is a great way to organize code instead of using Common.css and Common.js for everything.
A post about how to create workarounds in MediaWiki in a reasonably well-controlled manner.