Last modified: 2013-08-16 03:08:55 UTC
An editor at en.wp has noted that subscript is requried to be able to correctly edit some articles, "ECG leads, e.g. V4" was the example given.
Change 78495 had a related patch set uploaded by Steven Zhang: Add subscript tool https://gerrit.wikimedia.org/r/78495
Change 78495 merged by jenkins-bot: Create a subscript tool https://gerrit.wikimedia.org/r/78495
Now merged into master; will be deployed (as experimental) in the next push (so will be available on MediaWiki.org) - we will make this available to production wikis next week when we re-work the toolbar.