Where we're reminded that the stacking contexts with CSS is not tied to the DOM tree... Yay for making complicated rules which means you'll create such stacking contexts unexpectedly. This article comes with a couple of nice tricks to make things easier though like the isolation property. The CSS Stacking Context Inspector browser extension is good too.

Looks like a very comprehensive course about CSS.

Nice collection of effects which can be done purely using CSS. Really shows that JavaScript is often over used.

Interesting use of CSS custom properties to make dynamic color schemes easy and manageable for webpages.

Very thorough analysis on the kind of web frontend performances you can expect for most people on mobile. Since we basically need to reduce the footprint of such frontends to make this sustainable again this is a very welcome article.

Looks like an interesting CSS framework for including data visualization in HTML frontends. The fact that you can simply have the data in the HTML is particularly appealing.

Very nice introduction to animations with CSS. Per usual for me coming from a QML background it often sounds more involved than it should be but overall nice facilities are now provided straight from the browser.