How do we assign privileges for allowing non-admins to embed iframes from e.g. YouTube? When an iframe is added it is automatically striped when the post is saved.
It’s deprecated for WP multisite. You need to turn ON special option at the Settings->Users Role Editor->Multisite: “Enable “unfiltered_html” capability”. Only after that turning ON this capability will have sense.
“unfiltered_html” capability” is located under “General” group for the simple single WP site.