-
Abort API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 57
-
asm.js
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge Landed
- Mozilla Firefox Landed 22
-
Async functions
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox * Landed 52
-
Asynchronous Clipboard API
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 63
-
AV1 video codec
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 66
-
Background Sync API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Developing
-
Block autoplaying audio
- Google Chrome Landed
- Opera No signals
- Safari Technology Preview Considering
- Microsoft Edge No signals
- Mozilla Firefox Landed 66
-
Canvas Media Capture
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 43
-
Credential Management API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge Landed
- Mozilla Firefox Considering
-
CSS backdrop-filter (subset of Filter FX L2)
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Considering
-
CSS Box Alignment (for block layout)
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge Considering
- Mozilla Firefox Developing
-
CSS clip-path
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 54
-
CSS Containment
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 70
-
CSS Custom Properties (CSS Variables)
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 31
-
CSS display: flow-root
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 53
-
CSS environment variables (env())
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 65
-
CSS Font Rendering Controls (font-display)
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 58
-
CSS Font Variation Settings
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 62
-
CSS Fragmentation (break-* properties)
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Considering
-
CSS Grid Layout
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 52
-
CSS individual transform properties
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 72
-
CSS initial-letter
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Developing
-
CSS Logical Properties and Values
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Developing
- Microsoft Edge No signals
- Mozilla Firefox Developing
-
CSS min(), max(), and clamp()
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 75
-
CSS Motion Path
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 72
-
CSS Multiple column Layout
- Google Chrome No signals
- Opera Developing
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox * Landed 52
-
CSS overscroll-behavior
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 59
-
CSS prefers-reduced-motion Media Feature
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 63
-
CSS scroll anchoring
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Considering
- Microsoft Edge No signals
- Mozilla Firefox Landed 66
-
CSS Scroll Snap
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 68
-
CSS Scrollbars
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 64
-
CSS Shapes
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 62
-
CSS steps() timing functions
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 65
-
CSS Subgrids
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 71
-
Custom Elements
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 63
-
Device Orientation
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 6
-
Dialog element
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Considering
- Microsoft Edge No signals
- Mozilla Firefox Developing
-
Event-based form participation
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 72
-
Feature policy
- Google Chrome Developing
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 73
-
Fetch API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 39
-
Fullscreen API (Unprefixed)
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 64
-
Gamepad API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 29
-
HTML <img> lazy loading
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 75
-
HTML Imports
- Google Chrome Developing
- Opera Developing
- Safari Technology Preview Not planned
- Microsoft Edge No signals
- Mozilla Firefox Not planned
-
HTML Templates
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 22
-
HTMLCanvasElement.toBlob()
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 19
-
HTTP/2
- Google Chrome Developing
- Opera Developing
- Safari Technology Preview * Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 34
-
Indexed DB
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 10
-
Intersection Observer API
- Google Chrome Developing
- Opera Developing
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 55
-
JavaScript BigInt
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 68
-
JavaScript Modules
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 60
-
JavaScript public class fields
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 69
-
Link Rel Preload
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Developing
-
MathML
- Google Chrome Developing
- Opera No signals
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox * Landed 1
-
Media Capabilities (Decoding)
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 63
-
Media Recorder
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Developing
- Microsoft Edge No signals
- Mozilla Firefox Landed 29
-
Media Session API
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 71
-
Media Source Extensions
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 42
-
Microtask
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 69
-
Page Visibility API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 10
-
Passive Event Listeners
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview * Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 49
-
Payment Handler API
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Considering
-
Payment Request API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Developing
-
Performance Observer API
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 57
-
PerformanceServerTiming
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 61
-
Permissions API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 46
-
Permissions.request()
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Developing
-
Permissions.revoke()
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 47
-
Pointer events
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Developing
-
Pointer Lock
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 10
-
Promises
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 26
-
Push API
- Google Chrome Developing
- Opera Developing
- Safari Technology Preview No signals
- Microsoft Edge Landed
- Mozilla Firefox Landed 44
-
Readable Streams
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 65
-
RelativeTimeFormat
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Landed 65
-
requestIdleCallback (Background Tasks API)
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Considering
- Microsoft Edge No signals
- Mozilla Firefox Landed 55
-
Resize Observer API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Developing
- Microsoft Edge No signals
- Mozilla Firefox Landed 69
-
Screen Orientation API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge Landed
- Mozilla Firefox Landed 15
-
Service Worker
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox * Landed 44
-
Shadow DOM
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 63
-
Shadow Parts
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 72
-
Subresource Integrity
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 43
-
Text Decoration 4
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 70
-
Vibration API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Removed
- Microsoft Edge No signals
- Mozilla Firefox Landed 11
-
Visual Viewport API
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview Developing
- Microsoft Edge No signals
- Mozilla Firefox Landed 68
-
Web Animations API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge No signals
- Mozilla Firefox Landed 52
-
Web Application Manifest
- Google Chrome Landed
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge Landed
- Mozilla Firefox Landed 58
-
Web Audio API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Developing
- Microsoft Edge Landed
- Mozilla Firefox Landed 23
-
Web Authentication API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 60
-
Web Bluetooth API
- Google Chrome Developing
- Opera Developing
- Safari Technology Preview Not planned
- Microsoft Edge No signals
- Mozilla Firefox Considering
-
Web Speech Recognition
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Considering
-
Web Speech Synthesis
- Google Chrome Developing
- Opera Developing
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 45
-
WebAssembly (WASM)
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 52
-
WebGL 1.0
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 4
-
WebGL 2.0
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Developing
- Microsoft Edge No signals
- Mozilla Firefox Landed 52
-
WebP images
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview No signals
- Microsoft Edge Landed
- Mozilla Firefox Landed 65
-
WebRTC (Web Real-Time Communications)
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 37
-
WebSocket API
- Google Chrome Landed
- Opera Landed
- Safari Technology Preview Landed
- Microsoft Edge Landed
- Mozilla Firefox Landed 4
-
WebVR API 1.1
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge Landed
- Mozilla Firefox Landed 55
-
WebXR Device API
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Developing
-
Writable Streams
- Google Chrome No signals
- Opera No signals
- Safari Technology Preview No signals
- Microsoft Edge No signals
- Mozilla Firefox Developing