10 Cool CodePen Demos

May 2026

• Rheinturm Lichtzeitpegel Clock

  • HTML
  • CSS
  • JavaScript

  Niklas Knaack drew this clock using HTML and CSS: gradients, paths, animations... and added a little JavaScript to change the lights so the clock is always in time. An impressive drawing.

  

• Bioluminescent Tree

  • ThreeJS
  • JavaScript
  • Canvas

  This virtual tree changes colors and shapes every time it is generated (and you can click on it to generate it faster). The game the colors pop up and illuminate the tree are mesmerizing. Great job by Mustafa Enes.

  

• theSymmetrishQuality

  • P5js
  • JavaScript
  • Canvas

  Another generative art piece, this time by Sophia (fractal kitty), that is often in these lists with her demos. This time, the lines that form the spiral move hypnotically and peacefully... they kind of remind me of the wind lines in the news weather forecast on TV. Relaxing.

  

• The Never Ending Story

  • GSAP

  This infinite scroll experience was crafted by Joe Ben Taylor using Lenis and GSAP. It is interesting because the parallax effect is not just a very high page, it really goes forever and snaps perfectly as you scroll.

  

• Light card

  • CSS
  • HTML

  Amit Sheen crafted this floating card using HTML and CSS only (the demo includes a little JS, but it is for updating a CSS custom property). The result is stunning, especially considering that all the lights and shadows are achieved using CSS.

  

• The Witching Hour

  • HTML
  • CSS

  More CSS art! This time it is Gemma Croad who coded this peaceful night scene with purple lilies. It is amazing what she can achieve by combining shapes and gradients.

  

• Infinite Animation Speed Control

  • CSS

  By using custom properties and the turn unit instead of hardcoded values, Temani Afif is able to spin these figures smoothly in either direction. Try it, mouse over them and check how the spinning changes naturally.

  

• shape() generator

  • JavaScript
  • CSS
  • HTML

  This demo is from a testing account by Miss Fox. It is a simple to use shape generator for the experimental shape() function in CSS. It is easy to use and convenient, and it can be used also to learn and understand the different possibilities of this feature.

  

• FLIP text

  • GSAP
  • FLIP
  • JavaScript

  Steve Gardner creates amazing things with code. This animated words is an example of that. He expands, collapse, removes, and attaches letters to transform words smoothly with GSAP in this looping animation.

  

• Another world

  • WebGL

  A fantasy world from a the large windows of a castle or palace, that is as beautiful as it is dark. Created with WebGL, this demo by Liam Egan is impressive and evocative. I wish there was a way to move the camera to see more of the landscape.