This script (source) is a hack to highlight your username in yellow when there are new messages on your user talk page (since the in Timeless skin, the talk page link is hidden in a dropdown). This script should only be used with the Timeless skin – so add it to your timeless.js, not your common.js! For details on why this is not done by the skin, nor by the Echo extension, see tasks T215695 and T216046.
![Screenshot comparison](https://upload.wikimedia.org/wikipedia/commons/1/10/Timeless-newMessageHighlight_comparison.png)
To install on English Wikipedia, add the line
{{subst:lusc|User:Evad37/timeless-newMessageHighlight.js}}
to your timeless.js (which you'll probably have to create, unless you've used it before).
To install on another wiki, add the line
mw.loader.load('https://en.wikipedia.org/w/index.php?title=User:Evad37/timeless-newMessageHighlight.js&action=raw&ctype=text/javascript') // [[w:en:User:Evad37/timeless-newMessageHighlight]]
to your timeless.js on that other wiki (again, you'll probably have to create it, unless you've used it before).