This custom property trick solves a common CSS problem

Kevin Powell Media Inc.

Creative Coding CSS

April 28, 2025

Having to worry about browser support stinks, but thanks to a simple custom property trick, there’s a really easy way to create fallbacks for older browsers.

🔗 Links

Josh’s website: https://www.joshwcomeau.com/

Easing Wizard: https://easingwizard.com/

Animating height with interpoate-size tutorial: https://frontendmasters.com/tutorials/kevin-powell/calc-size-and-interpolate/

Final Code: https://codepen.io/kevinpowell/pen/vEYvBJd