So, for a while now, I have been importing this script via my global JS. In the past, it appeared to solve IE11 compatibility issues even with Wikia's global JS. However, I noticed today that it seems to have stopped working despite no changes on my end. To verify this, I put a test alert in my common JS and, indeed, it throws an error even though the IE11 script is supposed to provide the missing string function. Any ideas? I am thinking that perhaps the load order has changed? The WhatLinksHere script is still working even though, a while ago, it was updated to use Fetch. Fetch uses "String.prototype.includes" which is also not supported by IE11 but is covered in my IE11 script.