
CodePen 2.0 is now in public beta
A major update is now in public beta with a file system, build blocks, and realtime collaboration.
Web Standards
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A major update is now in public beta with a file system, build blocks, and realtime collaboration.

Why websites switch to mobile layout too soon and how to fix it with modern CSS.

How Safari 26 determines browser chrome color and a CSS workaround.

New random() and random-item() CSS functions from the Values and Units Level 5.

A practical guide to CSS spritesheets, steps(), and real-world trade-offs.

Markers, counters, and @counter-style tips for better bullets and numbering.

Border-shape: the future of the non-rectangular webNew property makes borders, shadows, and outlines follow custom geometry.

Hamburger menu built with <dialog>, minimal JS fallback, and smooth transitions.

Use progressive enhancement to ship masonry-style layouts now with JS polyfill or a CSS grid layout fallback.

scroll-state container queries can now detect scrollingChrome 144 adds a CSS-only scroll direction state for lightweight UI tweaks.

Low-specificity defaults via @layer plus modern typography and form, and media normalization.

A practical recipe for popover menus that animate, and flip to fit the viewport.