Change 767274 had a related patch set uploaded (by MusikAnimal; author: MusikAnimal):

[mediawiki/core@master] mediawiki.notification: add option to append CSS classes to notification

https://gerrit.wikimedia.org/r/767274

Change 767275 had a related patch set uploaded (by MusikAnimal; author: MusikAnimal):

[mediawiki/extensions/Disambiguator@master] ext.disambiguator: add CSS class to notification so it can be hidden

https://gerrit.wikimedia.org/r/767275

Throwing this in the sprint as some last minute maintenance for the Disambiguation project. It's low-risk and should make for an easy code review.

Change 767274 merged by jenkins-bot:

[mediawiki/core@master] mediawiki.notification: add option to append CSS classes to notification

https://gerrit.wikimedia.org/r/767274

Change 767275 merged by jenkins-bot:

[mediawiki/extensions/Disambiguator@master] ext.disambiguator: add CSS class to notification so it can be hidden

https://gerrit.wikimedia.org/r/767275

QA notes:

The goal here is to allow users to modify their personal CSS to hide the notification. This can be done at Special:MyPage/common.css -- where common.css applies to all skins. For example on the Beta English Wikipedia: https://en.wikipedia.beta.wmflabs.org/wiki/Special:MyPage/common.css (make sure you're logged in). Then add the following CSS and save:

.mw-disambiguator-notification { display: none; }

Then the disambiguation notifications should never show, i.e. by typing [[New York]] in the 2010 source editor on any article.

Thanks @MusikAnimal for the QA notes. I was able to verify that the disambiguation notification is disabled when the CSS is added to the user's page