# Now You Can Use

> Fast, no-nonsense Web Platform Baseline compatibility reference for web developers and AI coding agents.

Now You Can Use tracks Baseline status for web platform features across the Core 4 browser engines:
- Google Chrome / Chromium (Blink)
- Mozilla Firefox (Gecko)
- Apple Safari (WebKit)
- Microsoft Edge (Blink)

## Baseline Status Definitions

- **Widely Available**: Interoperably supported across all Core 4 browser engines for 30 months or longer. Universally safe for production use without fallbacks or polyfills.
- **Newly Available**: Interoperably supported across all Core 4 browser engines, but within the initial 30-month period.
- **Limited Availability**: Supported in fewer than all Core 4 browser engines. Feature detection, progressive enhancement, or polyfills recommended.

## Machine-Readable Resources & Feeds

- [Full Features Plaintext Catalog](https://nowyoucanuse.com/llms-full.txt): Complete directory of all 1191 tracked features with baseline status and browser support.
- [RSS 2.0 Feed](https://nowyoucanuse.com/feed.xml): Syndication feed of newly available web features.
- [Atom 1.0 Feed](https://nowyoucanuse.com/feed.atom): Atom syndication feed of newly available web features.
- [Widely Available RSS Feed](https://nowyoucanuse.com/feed--widely.xml): Feed of features reaching Widely Available status.
- [Limited Availability RSS Feed](https://nowyoucanuse.com/feed--limited.xml): Feed of features with limited browser support.
- [OpenSearch Description](https://nowyoucanuse.com/opensearch.xml): XML description for browser search autodiscovery.
- [XML Sitemap](https://nowyoucanuse.com/sitemap.xml): Machine sitemap of all pages and feeds.

## Canonical Search Syntax

- URL format: `https://nowyoucanuse.com/search--{query}.html` (zero query strings, e.g. `https://nowyoucanuse.com/search--subgrid.html`)

## Core Categories

- [CSS Features](https://nowyoucanuse.com/timeline--category--css.html): 101 features
- [HTML elements Features](https://nowyoucanuse.com/timeline--category--html-elements.html): 98 features
- [Selectors Features](https://nowyoucanuse.com/timeline--category--selectors.html): 46 features
- [JavaScript Features](https://nowyoucanuse.com/timeline--category--javascript.html): 43 features
- [Forms Features](https://nowyoucanuse.com/timeline--category--forms.html): 40 features
- [WebGL extensions Features](https://nowyoucanuse.com/timeline--category--webgl-extensions.html): 37 features
- [WebAssembly Features](https://nowyoucanuse.com/timeline--category--webassembly.html): 22 features
- [Media queries Features](https://nowyoucanuse.com/timeline--category--media-queries.html): 21 features
- [Fonts Features](https://nowyoucanuse.com/timeline--category--fonts.html): 19 features
- [Performance Features](https://nowyoucanuse.com/timeline--category--performance.html): 19 features
- [Text Features](https://nowyoucanuse.com/timeline--category--text.html): 19 features
- [Scrolling Features](https://nowyoucanuse.com/timeline--category--scrolling.html): 18 features
- [Arrays Features](https://nowyoucanuse.com/timeline--category--arrays.html): 17 features
- [Layout Features](https://nowyoucanuse.com/timeline--category--layout.html): 17 features
- [HTML Features](https://nowyoucanuse.com/timeline--category--html.html): 16 features
- [Progressive web app Features](https://nowyoucanuse.com/timeline--category--progressive-web-app.html): 15 features
- [Typed arrays Features](https://nowyoucanuse.com/timeline--category--typed-arrays.html): 14 features
- [Units Features](https://nowyoucanuse.com/timeline--category--units.html): 14 features
- [Canvas Features](https://nowyoucanuse.com/timeline--category--canvas.html): 13 features
- [Background Features](https://nowyoucanuse.com/timeline--category--background.html): 12 features
- [Color types Features](https://nowyoucanuse.com/timeline--category--color-types.html): 12 features
- [Media elements Features](https://nowyoucanuse.com/timeline--category--media-elements.html): 12 features
- [Strings Features](https://nowyoucanuse.com/timeline--category--string.html): 12 features
- [Clipping, shapes, and masking Features](https://nowyoucanuse.com/timeline--category--clipping-shapes-masking.html): 11 features
- [Security Features](https://nowyoucanuse.com/timeline--category--security.html): 11 features
- [Web components Features](https://nowyoucanuse.com/timeline--category--web-components.html): 11 features
- [WebXR Features](https://nowyoucanuse.com/timeline--category--webxr.html): 11 features
- [Typographic font features Features](https://nowyoucanuse.com/timeline--category--font-features.html): 10 features
- [Animation Features](https://nowyoucanuse.com/timeline--category--animation.html): 9 features
- [Internationalization Features](https://nowyoucanuse.com/timeline--category--intl.html): 9 features
- [Reporting Features](https://nowyoucanuse.com/timeline--category--reporting.html): 9 features
- [Text wrap Features](https://nowyoucanuse.com/timeline--category--text-wrap.html): 9 features
- [Clipboard Features](https://nowyoucanuse.com/timeline--category--clipboard.html): 8 features
- [Workers Features](https://nowyoucanuse.com/timeline--category--workers.html): 8 features
- [Containment Features](https://nowyoucanuse.com/timeline--category--containment.html): 7 features
- [DOM Features](https://nowyoucanuse.com/timeline--category--dom.html): 7 features
- [Fetch Features](https://nowyoucanuse.com/timeline--category--fetch.html): 7 features
- [JavaScript modules Features](https://nowyoucanuse.com/timeline--category--js-modules.html): 7 features
- [Print media Features](https://nowyoucanuse.com/timeline--category--print.html): 7 features
- [Sensors Features](https://nowyoucanuse.com/timeline--category--sensors.html): 7 features
- [CSS object models Features](https://nowyoucanuse.com/timeline--category--cssom.html): 6 features
- [Image formats Features](https://nowyoucanuse.com/timeline--category--image-formats.html): 6 features
- [Iterators Features](https://nowyoucanuse.com/timeline--category--iterators.html): 6 features
- [Landmark elements Features](https://nowyoucanuse.com/timeline--category--landmark-elements.html): 6 features
- [Positioning Features](https://nowyoucanuse.com/timeline--category--positioning.html): 6 features
- [Promises Features](https://nowyoucanuse.com/timeline--category--promises.html): 6 features
- [SVG Features](https://nowyoucanuse.com/timeline--category--svg.html): 6 features
- [Storage Features](https://nowyoucanuse.com/timeline--category--storage.html): 6 features
- [Streams Features](https://nowyoucanuse.com/timeline--category--streams.html): 6 features
- [Credential management Features](https://nowyoucanuse.com/timeline--category--credential-management.html): 5 features
- [Custom elements Features](https://nowyoucanuse.com/timeline--category--custom-elements.html): 5 features
- [Explicit defaults Features](https://nowyoucanuse.com/timeline--category--explicit-defaults.html): 5 features
- [Font synthesis Features](https://nowyoucanuse.com/timeline--category--font-synthesis.html): 5 features
- [HTTP Features](https://nowyoucanuse.com/timeline--category--http.html): 5 features
- [Messaging Features](https://nowyoucanuse.com/timeline--category--messaging.html): 5 features
- [Multi-column Features](https://nowyoucanuse.com/timeline--category--multi-column.html): 5 features
- [Resource hints Features](https://nowyoucanuse.com/timeline--category--resource-hints.html): 5 features
- [Ruby Features](https://nowyoucanuse.com/timeline--category--ruby.html): 5 features
- [Selection Features](https://nowyoucanuse.com/timeline--category--selection.html): 5 features
- [Speech Features](https://nowyoucanuse.com/timeline--category--speech.html): 5 features
- [Transitions (CSS) Features](https://nowyoucanuse.com/timeline--category--transitions.html): 5 features
- [View transitions Features](https://nowyoucanuse.com/timeline--category--view-transitions.html): 5 features
- [Web audio Features](https://nowyoucanuse.com/timeline--category--web-audio.html): 5 features
- [WebGL Features](https://nowyoucanuse.com/timeline--category--webgl.html): 5 features
- [Container queries Features](https://nowyoucanuse.com/timeline--category--container-queries.html): 4 features
- [Cookies Features](https://nowyoucanuse.com/timeline--category--cookies.html): 4 features
- [Counters Features](https://nowyoucanuse.com/timeline--category--counters.html): 4 features
- [File system access Features](https://nowyoucanuse.com/timeline--category--file-system.html): 4 features
- [Flexbox Features](https://nowyoucanuse.com/timeline--category--flexbox.html): 4 features
- [Gamepad Features](https://nowyoucanuse.com/timeline--category--gamepad.html): 4 features
- [Grid Features](https://nowyoucanuse.com/timeline--category--grid.html): 4 features
- [Images Features](https://nowyoucanuse.com/timeline--category--images.html): 4 features
- [Lists Features](https://nowyoucanuse.com/timeline--category--lists.html): 4 features
- [Primitive types Features](https://nowyoucanuse.com/timeline--category--primitive-types.html): 4 features
- [Regular expressions Features](https://nowyoucanuse.com/timeline--category--regexps.html): 4 features
- [WebDriver Features](https://nowyoucanuse.com/timeline--category--webdriver.html): 4 features
- [WebRTC Features](https://nowyoucanuse.com/timeline--category--webrtc.html): 4 features
- [Blend mode Features](https://nowyoucanuse.com/timeline--category--blend-mode.html): 3 features
- [Borders and outlines Features](https://nowyoucanuse.com/timeline--category--borders-outlines.html): 3 features
- [Gradients Features](https://nowyoucanuse.com/timeline--category--gradients.html): 3 features
- [Image scaling Features](https://nowyoucanuse.com/timeline--category--image-scaling.html): 3 features
- [JSON Features](https://nowyoucanuse.com/timeline--category--json.html): 3 features
- [Maps Features](https://nowyoucanuse.com/timeline--category--maps.html): 3 features
- [MathML Features](https://nowyoucanuse.com/timeline--category--mathml.html): 3 features
- [Payments Features](https://nowyoucanuse.com/timeline--category--payments.html): 3 features
- [Reading order Features](https://nowyoucanuse.com/timeline--category--reading-order.html): 3 features
- [Scroll markers Features](https://nowyoucanuse.com/timeline--category--scroll-markers.html): 3 features
- [Transforms Features](https://nowyoucanuse.com/timeline--category--transforms.html): 3 features
- [WebAuthn Features](https://nowyoucanuse.com/timeline--category--webauthn.html): 3 features
- [WebGPU Features](https://nowyoucanuse.com/timeline--category--webgpu.html): 3 features
- [White space Features](https://nowyoucanuse.com/timeline--category--white-space.html): 3 features
- [Worklets Features](https://nowyoucanuse.com/timeline--category--worklets.html): 3 features
- [XML Features](https://nowyoucanuse.com/timeline--category--xml.html): 3 features
- [Collections Features](https://nowyoucanuse.com/timeline--category--collections.html): 2 features
- [Compute pressure Features](https://nowyoucanuse.com/timeline--category--compute-pressure.html): 2 features
- [Geolocation Features](https://nowyoucanuse.com/timeline--category--geolocation.html): 2 features
- [IndexedDB Features](https://nowyoucanuse.com/timeline--category--indexeddb.html): 2 features
- [Parsing and serialization Features](https://nowyoucanuse.com/timeline--category--parsing-and-serialization.html): 2 features
- [Resource integrity Features](https://nowyoucanuse.com/timeline--category--integrity.html): 2 features
- [Sets Features](https://nowyoucanuse.com/timeline--category--sets.html): 2 features
- [Text fragments Features](https://nowyoucanuse.com/timeline--category--text-fragments.html): 2 features
- [WebMCP Features](https://nowyoucanuse.com/timeline--category--webmcp.html): 2 features
- [CSS environment variables Features](https://nowyoucanuse.com/timeline--category--environment-variables.html): 1 features