Web Platform Baseline Status Breakdown
Total Features: 1219
Categories:
All
CSS (102)
HTML elements (100)
Selectors (46)
JavaScript (43)
Forms (42)
WebGL extensions (37)
Text (26)
WebAssembly (22)
Media queries (21)
Scrolling (20)
Fonts (19)
Performance (19)
Arrays (17)
Layout (17)
HTML (16)
Progressive web app (15)
Typed arrays (14)
Units (14)
Canvas (13)
Color types (13)
Strings (13)
Background (12)
Media elements (12)
Security (12)
Animation (11)
Clipping, shapes, and masking (11)
Web components (11)
WebXR (11)
Typographic font features (10)
DOM (9)
Internationalization (9)
Iterators (9)
Reporting (9)
Text wrap (9)
Workers (9)
Clipboard (8)
CSS object models (7)
Containment (7)
Fetch (7)
JavaScript modules (7)
Print media (7)
Sensors (7)
Container queries (6)
Explicit defaults (6)
Image formats (6)
Landmark elements (6)
Multi-column (6)
Positioning (6)
Promises (6)
SVG (6)
Storage (6)
Streams (6)
Credential management (5)
Custom elements (5)
Font synthesis (5)
HTTP (5)
Lists (5)
Messaging (5)
Resource hints (5)
Ruby (5)
Selection (5)
Speech (5)
Transitions (CSS) (5)
View transitions (5)
Web audio (5)
WebGL (5)
Anchor positioning (4)
Cookies (4)
Counters (4)
File system access (4)
Flexbox (4)
Gamepad (4)
Grid (4)
Images (4)
Primitive types (4)
Regular expressions (4)
WebDriver (4)
WebRTC (4)
Blend mode (3)
Borders and outlines (3)
Geolocation (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)
IndexedDB (2)
Parsing and serialization (2)
Resource integrity (2)
Sets (2)
Text fragments (2)
WebMCP (2)
CSS environment variables (1)
2026
2 features
• September 2026
Newly Available
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
27
Edge
124
Baseline Date: Sep 14, 2026
• 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 featuresLimited Availability
3 features
• In Progress / Not Yet Baseline
Limited
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
27
Edge
—
Status: Incomplete cross-engine support
Limited
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