Not much has happened in the past 10 years .. still, there are a few useful ressources to the current state of HTML mail.
Displaying posts tagged: css
Different ways of on-demand loading in WordPress (plugins, themes)
(or: WordPress: Different ways of implementing on-demand loading)
A collection of several CSS-only responsive / mobile navigation menus. What I found after digging around for CSS-only mobile navigations using the :checked pseudo class (initially thought I could use the :target pseudo class). My aim was digging up actual, working, real life examples, to deduct how :checked / :target / :focus works exactly, and then …