The summary tab for layer properties has been enhanced with 1.16. The documentation says :
“image, table and hyperlinks, as well as various HTML formats including paragraph, list, font size, bold, and so on are now honored in the layer description for a portal item or service layer properties”.
I found out that this is only true for Feature Services. It would be great if it could also be the case for Web Maps, Web Map Layers and Feature Service Layers :

Thank you.