EQCSS is a CSS Reprocessor that introduces Element Queries, Scoped CSS, a Parent selector, and responsive JavaScript to all browsers IE8 and up

Polyfills the ResizeObserver API.

😎 📏 React hook to measure an element's size and handle responsive components.

📦 Modular responsive component

Prolyfill for CSS Container Queries

A simple, tiny alternative to element/container queries

A CSS UI library exploring how next-gen HTML & CSS features can change the way we create components. Designed to be used by professional teams as well as tinkering hobbyists.

CSSplus is a collection of CSS Reprocessor plugins that dynamically update CSS variables

Make container queries that harness the power of Ember

Create self-positioning popovers with native CSS—no JavaScript required. Made for Svelte 5. Build tooltips, dropdowns and any floating UI components.

Friendly container queries for Ember

Add JavaScript tests to <link> tags to toggle stylesheets

A modern starter CSS library with container queries, a real CSS grid system, clamp() powered typography and spacing sizes, color-mix() shade utilities, and custom properties.

vue-container-query

Responsive elements script.

My personal website, built with Next.js 15

Lightweight, accessible Stylus library — OKLCH colours, native @layer, CSS Grid + container queries, light-dark(), WCAG 2.2 AA. Sub-5kb core.

An element query plugin for jsincss

Nested master detail example with container queries

Modern, native, standards compliant, pure CSS UI template.