Following on from #3601282: Additional CSS Class enforces value set in form display settings, if the iframe element is set to display using the Iframe without title formatter, the manually added class is not applied.
1. Create a content type with an iframe field, with Additional CSS Class exposed
2. Set it to display as Iframe without title
3. Create a node with an iframe
The class is not applied.
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Comment #3
malcomio commented