Ada Rose Edwards takes a look at some of the newer browser APIs and how they fit together:
These new APIs are powerful individually but also they complement each other beautifully, CSS custom properties being the common thread which goes through them all as it is a low level change to CSS.
The post itself is a showcase to them.
Speaking of new browser APIs, that was a whole subject on ShopTalk a few weeks back.
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A Rube Goldberg Machine is a post from CSS-Tricks