This started on May 31st. The missing distance between page heading and first text line/infobox isn't shown in every article and it makes a difference if you are logged in or not. Some articles have a correct layout when you are not logged it. I can't see any rule when this happens so I don't think that it depends on the content of an article. Btw it happens with the newest version of Safari (11.1.1), too.
Jun 7 2018
Dec 16 2016
It takes additional action for something that should be as easy as possible. Perhaps someone accidently presses the button but how often will this happen, once in a year? And for this once no one wants to confirm all the other times. It disrupts the workflow, it steals time and even an accidently pressed button isn't a catastrophe, the watchlist is still there.
Nov 4 2015
Sep 11 2015
In Monobook the icons are black but should be white like in Vector.