The Web platform: Browser technologies
Core platform
Fetch (includes CORS) ⓤ ⓤ ⓣ ⓣ ⚑ ⚑
CSS features
Animations ⓤ ⓜ ⓣ ❢
Border radius (rounded corners) ⓤ ⓜ ⚑
Downloadable fonts (@font-face) ⓤ ⓜ ⓣ ⚑
Feature queries (@supports) ⓤ ⓜ ⓣ
Fixed positioning (position:fixed) ⓤ ⓜ ⚑
Flexible box layout (Flexbox) ⓤ ⓜ ⓣ ⚑
Image Values and Replaced Content ⓣ
Multiple-column layout ⓤ ⓜ ⓣ ⚑
Sticky positioning (position:sticky) ⓤ ⓜ ❢
Transitions ⓤ ⓜ ⓣ ⚑
Graphics and typography
Media
Platform interaction, events, messaging
Cross-document messaging ⓤ ⓜ ⓣ ⚑
UI Events (formerly DOM Events) ⓣ
HTML Media Capture (the capture attribute) ⓣ
Storage and Files
Storage (NavigatorStorage+StorageManager)
Web Storage (localStorage) ⓤ ⓜ ⓣ ❢
Real-time communication
Object RTC (ORTC) API for WebRTC
Web Components
HTML bonus features
classList (DOMTokenList) ⓤ ⓜ ⓜ ⓣ ⚑
dataset (data-* attributes) ⓤ ⓣ ⚑
Session-history management ⓤ ⓜ ⓣ ⚑
Performance optimization and analysis
Web Workers ⓤ ⓜ ⓣ ⚑
Timing control for script-based animations ⓤ ⚑
SIMD (Single instruction, multiple data)
Security and privacy
Content Security Policy (CSP) ⓣ
Tracking Preference Expression (DNT)
Other core-platform bonus features
DOM Parsing and Serialization ⓣ
Internationalization API ⓤ ⓜ ⓣ
Foundations
Various other
A feature history of the modern Web Platform
Read more on https://platform.html5.org/