- Filters:
- Newly available
- Widely available
- Limited availability
- One missing engine
- Discouraged
- Opposed
- All features
- Browser releases:
- Chrome
- Chrome Android
- Edge 146
- Firefox 149
- Firefox for Android 149
- Safari 26.4
- Safari on iOS 26.4
New features in Safari 26.4 (released on 2026-03-24)
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Iterator.concat()
Baseline Newly Available (since 2026-03-24)The
Iterator.concat()JavaScript method returns an iterator that yields values from a sequence of iterators, exhausting each iterator before moving on to the next.- Chrome 146 Released on 2026-03-10
- Chrome Android 146 Released on 2026-03-10
- Edge 146 Released on 2026-03-13
- Firefox 147 Released on 2026-01-13
- Firefox for Android 147 Released on 2026-01-13
- Safari 26.4 Released on 2026-03-24
- Safari on iOS 26.4 Released on 2026-03-24
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Readable byte streams
Baseline Newly Available (since 2026-03-24)A
ReadableStreamconstructed 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 Released on 2021-03-02
- Chrome Android 89 Released on 2021-03-02
- Edge 89 Released on 2021-03-04
- Firefox 102 Released on 2022-06-28
- Firefox for Android 102 Released on 2022-06-28
- Safari 26.4 Released on 2026-03-24
- Safari on iOS 26.4 Released on 2026-03-24
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WebTransport
Baseline Newly Available (since 2026-03-24)The
WebTransportAPI transmits data between a client and a server, by using the HTTP/3 protocol.- Chrome 97 Released on 2022-01-04
- Chrome Android 97 Released on 2022-01-04
- Edge 97 Released on 2022-01-06
- Firefox 114 Released on 2023-06-06
- Firefox for Android 114 Released on 2023-06-06
- Safari 26.4 Released on 2026-03-24
- Safari on iOS 26.4 Released on 2026-03-24