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Web Platform Baseline Status Breakdown Total Features: 1191
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Categories: All CSS (101) HTML elements (98) Selectors (46) JavaScript (43) Forms (40)
WebGL extensions (37) WebAssembly (22) Media queries (21) Fonts (19) Performance (19) Text (19) Scrolling (18) Arrays (17) Layout (17) HTML (16) Progressive web app (15) Typed arrays (14) Units (14) Canvas (13) Background (12) Color types (12) Media elements (12) Strings (12) Clipping, shapes, and masking (11) Security (11) Web components (11) WebXR (11) Typographic font features (10) Animation (9) Internationalization (9) Reporting (9) Text wrap (9) Clipboard (8) Workers (8) Containment (7) DOM (7) Fetch (7) JavaScript modules (7) Print media (7) Sensors (7) CSS object models (6) Image formats (6) Iterators (6) Landmark elements (6) Positioning (6) Promises (6) SVG (6) Storage (6) Streams (6) Credential management (5) Custom elements (5) Explicit defaults (5) Font synthesis (5) HTTP (5) Messaging (5) Multi-column (5) Resource hints (5) Ruby (5) Selection (5) Speech (5) Transitions (CSS) (5) View transitions (5) Web audio (5) WebGL (5) Container queries (4) Cookies (4) Counters (4) File system access (4) Flexbox (4) Gamepad (4) Grid (4) Images (4) Lists (4) Primitive types (4) Regular expressions (4) WebDriver (4) WebRTC (4) Blend mode (3) Borders and outlines (3) Gradients (3) Image scaling (3) JSON (3) Maps (3) MathML (3) Payments (3) Reading order (3) Scroll markers (3) Transforms (3) WebAuthn (3) WebGPU (3) White space (3) Worklets (3) XML (3) Collections (2) Compute pressure (2) Geolocation (2) IndexedDB (2) Parsing and serialization (2) Resource integrity (2) Sets (2) Text fragments (2) WebMCP (2) CSS environment variables (1)
Showing 6 of 6 features

2026

1 features
• March 2026
Newly Available

A ReadableStream constructed with { type: "bytes" } reads bytes from a stream without making extra copies, improving efficiency for streams of large chunks. Also known as BYOB or bring your own buffer.

Chrome 89
Firefox 102
Safari 26.4
Edge 89
Baseline Date: Mar 24, 2026

2022

1 features
• June 2022
Widely Available

The streams API creates, composes, and consumes continuously generated data.

Chrome 67
Firefox 102
Safari 14.1
Edge 79
Baseline Date: Jun 28, 2022

Limited Availability

4 features
• In Progress / Not Yet Baseline

Asynchronous iteration of a stream allows you to use for await … of loops to iterate through a stream's incoming data.

Chrome 124
Firefox 110
Safari
Edge 124
Status: Incomplete cross-engine support

The ReadableStream.from() static method converts an iterable or async iterable object, such as an array or async generator function, into a readable stream.

Chrome
Firefox 117
Safari
Edge
Status: Incomplete cross-engine support

Streams are transferable objects, which can be moved between contexts such as windows and workers.

Chrome 87
Firefox 103
Safari
Edge 87
Status: Incomplete cross-engine support

The cancel() method of a TransformStream transformer cleans up resources when the readable side cancels or the writable side aborts.

Chrome
Firefox
Safari
Edge
Status: Incomplete cross-engine support