Well-intended product design can turn into a usability/accessibility nightmare. Something as simple as a button can be marked up with HTML/CSS in myriad ways. We can make sure it’s done properly with a sensible markup.
Despite prevailing wisdom to the contrary, you can safely deploy HTML emails styled with good old-fashioned CSS. Yes, I really just said that. Not all attributes will be invited to the party, but many of them work flawlessly with this method.