HTML for emails is notoriously difficult to get right. To be decent, HTML emails require arcane CSS rules, inline CSS, table layouts, etc., and testing in many

HTML for emails is notoriously difficult to get right. To be decent, HTML emails require arcane CSS rules, inline CSS, table layouts, etc., and testing in many different clients (because they all have their own quirks). Fixing something in for a client without breaking it for another client is not straight-forward either. Email solutions have worked around this via premade components—as a template, in React, or even as a UI with drag and drop.