HTML streaming as data format
Chrome 148 ships streaming HTML APIs to replace JSON for partial DOM updates Chrome for DevelopersTL;DW
- Declarative partial updates in Chrome 148 enable HTML to update without JavaScript—clock refreshes every second with zero JS code.
- Patch large DOM structures like menus into the page later, letting critical content render first for better performance.
- New streamHTML and streamHTMLUnsafe APIs let developers stream fetched HTML directly into the DOM without JSON parsing overhead.
- Island architecture pattern now easier for vanilla JavaScript developers without requiring heavy frameworks.
- HTML can replace JSON as the interchange format for streaming dynamic content to browsers.
- Chrome 148's partial updates represent one of the biggest HTML changes in a decade for UI performance wins.
TL;DW
- Declarative partial updates in Chrome 148 enable HTML to update without JavaScript—clock refreshes every second with zero JS code.
- Patch large DOM structures like menus into the page later, letting critical content render first for better performance.
- New streamHTML and streamHTMLUnsafe APIs let developers stream fetched HTML directly into the DOM without JSON parsing overhead.
- Island architecture pattern now easier for vanilla JavaScript developers without requiring heavy frameworks.
- HTML can replace JSON as the interchange format for streaming dynamic content to browsers.
- Chrome 148's partial updates represent one of the biggest HTML changes in a decade for UI performance wins.
Two new APIs — streamHTML and streamHTMLUnsafe — let servers push partial HTML directly into the DOM without JavaScript hydration. The demo shows a live clock updating every second via server-sent HTML, enabling island-architecture patterns where critical content renders first and non-essential sections patch in later.