- The :has CSS selector.
- Cascade Layers
- CSS Containers
- CSS Nesting
- Custom CSS properties. (I know people think this is overused. I’m telling you that we haven’t even started.)
- View Transitions
- Declarative Shadow DOM
- Origin Private File System
- Compression Streams
- Web streams and async iterators in general
- Atomics and SharedWorkers
- Service Workers. (Using “scope” to modularise service workers, for example, hasn’t been investigated much by the field.)
- Broadcast Channels
- JavaScript modules and import maps
- Trusted Types API
- AbortControllers
- Scoped CSS
- WebRTC data channels WebRTC 数据通道