Steps to reproduce:
- Open a page for editing in NWE.
- Add an external link, e.g. [https://example.org example.org]
- Preview the change.
Expected:
There should be the external link icon after the link.
Actual:
The icon is missing, as the .mw-body class is missing (https://phabricator.wikimedia.org/diffusion/SVEC/browse/master/components/externalLinks.less), other skins might require other classes.