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This task is about MediaWiki's Popups extension (which is sometimes also called "Page-Previews" or "Hovercards").

The line preview.el.hover( behavior.previewDwell, behavior.previewAbandon ); in the file src/ui/renderer.js causes a warning in the console of your web browser's developer tools:

See https://github.com/jquery/jquery-migrate/blob/3.0.1/warnings.md for documentation how to replace it. For anyone who plans to work on this, https://gerrit.wikimedia.org/r/#/c/381780/ and https://gerrit.wikimedia.org/r/#/c/382196/ are similar merged patches.

For developers, please note: The Popups extension uses a build process. After making your change you'll need to run the following code

npm install
npm run build

and commit the dist folder as part of your patch.

You are expected to provide a patch in Wikimedia Gerrit. See https://www.mediawiki.org/wiki/Gerrit/Tutorial for how to set up Git and Gerrit.