Currently this task does not explain why this task was created.
It describes a potential solution to an underlying problem that still needs to get defined...

There is no problem. It would just be nice to have. This is a good example of how data attributes should be used. Exposing this kind of information in a structured way helps gadget authors like myself. Of course, I understand that this is of lowest priority, and that's perfectly fine!

Ah, I think I should read https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Using_data_attributes ... :)

information in a structured way helps gadget authors

Thanks. That was the part I was missing initially.

Change 651506 had a related patch set uploaded (by Diwanshu885; owner: Diwanshu885):
[mediawiki/core@master] Add data attribute to the elements with class "history-size"

https://gerrit.wikimedia.org/r/651506

Change 651506 merged by jenkins-bot:
[mediawiki/core@master] Add data attribute to the elements with class "history-size"

https://gerrit.wikimedia.org/r/651506