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Web Platform Baseline Status Breakdown Total Features: 1219
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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)
Years: All 2026 2024 2015
Showing 3 of 3 features

2026

1 features
• February 2026
Newly Available

The getOrInsert() and getOrInsertComputed() methods of Map objects get a value, setting and getting a default value if needed.

Chrome 145
Firefox 144
Safari 26.2
Edge 145
Baseline Date: Feb 14, 2026

2024

1 features
• March 2024
Widely Available

The Object.groupBy() and Map.groupBy() static methods group values of arrays and iterables based on a function that returns a key for each value.

Chrome 117
Firefox 119
Safari 17.4
Edge 117
Baseline Date: Mar 5, 2024

2015

1 features
• July 2015
Widely Available

Map objects hold key-value pairs and remember the original insertion order of the keys.

Chrome 38
Firefox 13
Safari 8
Edge 12
Baseline Date: Jul 29, 2015