General Rules and Principles
Working at Johnson & Johnson for the past two years and helping to build their first loyalty program encompassing their top global brands, with a minimal of HTML & CSS support (namely Microsoft Outlook, a few versions of Gmail, and a handful of mostly non-US clients). Even 2.5% of a mailing list can still mean tens of thousands of recipients so it’s STILL in 2021, safest to use HTML 1 and CSS 2.
- CSS2 instead of CSS3
- Tables instead of Divs
- PNGs instead of SVGs
- Inline CSS instead of embedded styles or stylesheet
- HTML text instead of images containing text (yes, even CTA buttons)