CSS

A CSS Custom Property can be used to tweak colors darker when shown on light and lighter when shown on dark, making them pop in both cases.

There are no obvious CSS properties or values for making a @keyframe animation wait between iterations, or have a pause before starting. But Nils Riedmann cooked up a clever way to do it using linear() animation timing. I think this is cleaner than faking it with multiple benign keyframe steps. Remember linear is not the […]

One approach to color modes it to do it all in CSS with prefers-color-scheme media queries and/or the light-dark() function. A user toggle can be a future improvement.

A single HTML `progress` element can have quite an elaborate design with custom colors, a tooltip showing the active %, and even an entrance animation.

Sacha Greif introducing the State of CSS 2024 results: Let me make a prediction: we’ll look back at 2024 as the turning point between “CSS Classic” and “New CSS”. That feels intuitively true to me, except we won’t use those names. Check out work done on CSS Levels which define CSS4 and CSS5 “eras” (which […]

You can give a name (“custom ident”) to any scrolling element’s “timeline”, have a parent element pick it up, then have any other element use it for their own animation timeline. It’s a trip!

If you give a scroll or view timeline a –custom-ident name, then any descendent can “listen” to that timeline and base @keyframe animations off of it.

A rather exceptional CSS trick discovered by Roman Komarov that uses scroll driven animations to resize lines of text to fit exactly to their container.

If you’re creating a scroll-driven animation and the goal is “when the page is scrolling through this general section, animate the children” it’s probably going to involve passing scrolling data through custom properties.

The other day I needed to quickly see pixel dimensions that were exactly in a 9 / 16 aspect ratio. Like: 180 / 320. That’s perfectly in that ratio. You might be able to think of that one in your head, but how about 351 / 624? That’s harder to think of. And I wanted […]