CSS selectors cheatsheet
Good cheatsheet of CSS selectors.
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CSS Grid Generator
Handy-looking CSS grid generation tool.
BADA55.io - CSS hex color words for web developers
Amusing, and not always sfw, resource for colours with "interesting" names.
Placeholder support for contentEditable elements, without JavaScript
Handy method of adding placeholder-a-like text to contenteditable elements in a document.
Here’s what I didn’t know about “content” - Manuel Matuzović
Deepish dive into what the content property can do in CSS.
Media Queries Level 5
Some detail on the CSS query that lets you detect of someone has their OS set to prefer dark mode rather than light.
Hexcodle | The Daily Hexcode Guessing Game!
While it's fairly trivial to beat in a number of different ways, it's a fun idea.