I haven't used it lately, but Mail's Stationery used to be HTML coded stuff and graphics. Now it might use coding that is "off" from a PC's standpoint so what you see is not what you get, but in theory it should work.
On a Mac since 1984. Currently: 24" M1 iMac, M2 Pro Mac mini with 27" BenQ monitor, M2 Macbook Air, MacOS 14.x; iPhones, iPods (yes, still) and iPads.
