Steps to replicate the issue (include links if applicable):
- Visit https://doc.wikimedia.org/mediawiki-core/master/js/#!/api/OO.ui.ComboBoxInputWidget
- Click "Live preview" tab
What happens?:
Message: Uncaught SyntaxError: illegal character U 0040
What should have happened instead?:
A live preview.
Other information (browser name/version, screenshots, etc.):
Chrome, Firefox