Browser Compatibility Checker
Search curated web platform features with Baseline status and Chrome, Firefox, and Safari support
60 of 60 features shown. Data is embedded locally — no network requests.
Style elements based on the size of a containing element instead of the viewport.
Nested grid items participate in the parent grid tracks.
One-dimensional layout for distributing space along a row or column.
Two-dimensional layout with explicit rows and columns.
Set a preferred width-to-height ratio on boxes.
Spacing between flex and grid items without margins.
Elements stick within a scroll container until a threshold.
Snap scroll positions to defined points in a scroll container.
Select an element if it contains descendants matching a selector.
Match any selector in a list with shorter specificity rules.
Like :is() but always zero specificity.
Show focus rings only for keyboard-style focus.
Negate multiple selectors in one :not() expression.
Perceptually uniform color space for predictable gradients.
Mix two colors in a chosen color space in CSS.
Define reusable --token values with cascade inheritance.
Use the computed text color as a fill or border value.
Fluid values bounded by minimum and maximum sizes.
Single font files with adjustable axes like weight and width.
Truncate multi-line text after a set number of lines.
Balance headline line lengths for nicer rag.
Promise-based HTTP requests replacing XMLHttpRequest.
Syntactic sugar for promise-based asynchronous code.
Safely access nested properties when intermediates may be null.
Default values only when left side is null or undefined.
Await promises at module top level in ES modules.
True private fields on class instances.
Deep-copy structured data including typed arrays and Dates.
Relative indexing including negative indices.
Safer own-property check than hasOwnProperty.call().
Match patterns preceded by a fixed-width lookbehind assertion.
Observe element visibility relative to a root for lazy loading.
React to element content-box size changes.
Watch DOM tree and attribute mutations asynchronously.
Define reusable autonomous HTML tags with JavaScript classes.
Encapsulated DOM and styles for web components.
Native modal and non-modal dialog with ::backdrop.
Top-layer popovers with popover attribute and showPopover().
Server-render shadow roots with a <template shadowroot>.
Key-value string storage persisted per origin.
Structured transactional database in the browser.
Request/response cache used by service workers.
Key-value storage cleared when the tab closes.
Full-duplex communication channel over a single TCP connection.
Programmable network proxy for offline and push workflows.
Push notifications from a server via service workers.
Send analytics on page unload without blocking navigation.
Readable and writable byte streams for incremental I/O.
GPU-accelerated 2D/3D graphics with GLSL ES 3.00.
Modern GPU compute and rendering API succeeding WebGL.
Immediate-mode 2D drawing to a bitmap surface.
Render to canvas in a worker without DOM coupling.
Apply blur, color matrix, and other filter primitives in SVG.
Peer-to-peer audio, video, and data channels.
Append media segments for adaptive streaming players.
Floating always-on-top video window.
Low-level audio/video encode and decode in JavaScript.
Subtle crypto for digest, sign, encrypt in secure contexts.
Programmatic access to stored passwords and federated credentials.
Enforce typed sinks to mitigate DOM XSS.
Search CSS, JavaScript, and DOM APIs with Baseline status and Chrome, Firefox, and Safari minimum versions — offline, in your browser.
Validate .env syntax and spot likely leaked credentials or placeholder secrets.
Build an Apache .htaccess — HTTPS redirects, rewrites, error pages, security headers, and basic auth
A physics playground with two engines sharing one canvas. The fluid mode runs a real Eulerian Navier-Stokes solver — semi-Lagrangian advection, explicit diffusion, Jacobi pressure projection and vorticity confinement — that you paint with dye and velocity using mouse or touch. The particle mode is a damped Verlet N-body engine with gravity wells, Coulomb attractors and repulsors, spring links, wall restitution and elastic circle collisions. Particle counts adapt to the device (100k target on WebGL2 desktop, 2k-5k on CPU fallback), and every configuration exports as runnable code: a Matter.js world, a PixiJS ticker setup, or a standalone vanilla Canvas engine.
Generate function calling JSON schemas from TypeScript interfaces
Interactive arena for algorithms and data structures: eight sorting algorithms racing on one seeded input, six pathfinding algorithms walking generated mazes, and BST, AVL, Red-Black, B-tree, heap and trie operations replayed step by step with rotations highlighted. Every run shows the Big-O table and the phase-highlighted reference implementation in four languages, and compared values can be played as pitch (sonification) through the shared audio engine. Everything runs client-side; inputs never leave the browser.
Build an Ansible playbook — hosts, vars, and tasks with modules — as YAML
