Steps to reproduce:
- As anon user On Special:Search in enwiki betalabs perform a search for lake - https://en.wikipedia.beta.wmflabs.org/w/index.php?search=lake&title=Special:Search&profile=advanced&fulltext=1&ns0=1
- Hover for the arrow and click on it to open the QuickView for the first returned result - "Baikal seal"
- The QuickView will be shown at the bottom of a page
The Console will display the error:
Error: Syntax error, unrecognized expression: [title=Baikal seal] jQuery 4 error tokenize Sizzle find handler https://en.wikipedia.beta.wmflabs.org/w/index.php?search=lake&title=Special:Search&profile=advanced&fulltext=1&ns0=1&wprov=acrw1_-1 line 10