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DEV Community

Authentication Security Deep Dive: From Brute Force to Salted Hashing (With Java Examples) Why AI Systems Don’t Fail — They Drift Spilling beans for how i learn for exam😁"Reinforcement Learning Cheat Sheet" I Replaced Chrome with Safari for AI Browser Automation. Here's What Broke (and What Finally Worked) How Python Borrows Other People's Work The $40 Architecture: Processing 1 Billion API Requests with 99.99% Uptime Vibe Coding: A Workflow Guide (From Zero to SaaS) Most webhook security guides protect the wrong side. The scary part is delivery. Headless CMS for TanStack Start: Build a Blog with Cosmic EU Age Verification App "Hacked in 2 Minutes" — What Actually Happened Comfy Cloud’s delete function does not actually remove files Running AI Models on GPU Cloud Servers: A Beginner Guide Event-driven media intelligence with AWS Step Functions and Bedrock I scored 500 AI prompts across 8 quality dimensions — here's what broke How to Call Google Gemini API from Next.js (Free Tier, No Backend Needed) The Portal Protocol: Reclaiming Human Connection in the Age of AI How to Fix Your Team's Scattered Knowledge Problem With a Self-Hosted Forum Intro to tc Cloud Functors: A Graph-First Mental Model for the Modern Cloud Designing Multi-Tenant Backends With Both Ownership and Team Access I Built a Neumorphic CSS Library with 77+ Components — Here's What I Learned PostgreSQL Performance Optimization: Why Connection Pooling Is Critical at Scale Cómo construí un SaaS multi-rubro para gestionar expensas en Argentina con FastAPI + Vue 3 🚀 I Built an Ethical Hacking Scanner Tool – Open Source Project I Replaced /usage and /context in Claude Code With a Single Statusline A Pythonic Way to Handle Emails (IMAP/SMTP) with Auto-Discovery and AI-Ready Design I Collected 8.9 Million Polymarket Price Points — Here's What I Found About How Markets Really Move EcoTrack AI — Carbon Footprint Tracker & Dashboard Everyone's Using AI. No One Agrees How. 5 self-hosted ebook managers worth trying in 2026 Building Your First AI Agent with LangChain: From Chatbot to Autonomous Assistant
10 Cool CodePen Demos (May 2026)
Alvaro Montoro · 2026-06-24 · via DEV Community
Cover image for 10 Cool CodePen Demos (May 2026)

Alvaro Montoro

Rheinturm Lichtzeitpegel Clock

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

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

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

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

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

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

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

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

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

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.