HTML email
Call me a glutton for punishment, but I love designing and coding HTML email, whether getting Lotus Notes to play nicely or Dark Mode support.
The tricks and techniques involved in getting an email to display nicely across the multitude of email clients is a hugely enjoyable challenge.
It’s a hark back to my early days of development, catering for the many quirks in browsers like Internet Explorer 6 and 7, and a stark reminder of how things could have been on the web if not for the web standards movement.