Out-of-order HTML streaming moves from JS frameworks into browsers

Out-of-order HTML streaming, which lets users view and interact with a page before it fully loads, is moving from JS frameworks into browsers. Chrome and Edge 150 ship declarative <template for> and processing instructions, with Safari and Firefox signaling support.

• Chrome and Edge 150 ship declarative <template for> for out-of-order HTML patching
• Fetch API textStream() arrives in version 151
• JS streamHTML and streamAppendHTML methods go through separate standardization
• WebKit published a positive position, Mozilla signaled interest