Intent to Prototype: MutationObserver reflection for <template for>

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Nov 3, 2026, 2:47:26 PM (3 days ago) Nov 3
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Explainer
https://github.com/WICG/declarative-partial-updates/blob/main/template-mutation-observer-explainer.md

Specification
https://github.com/whatwg/html/issues/13008#issuecomment-6601157313

Summary
Adds metadata from <template for> to mutation records, to allow flow and error control for declarative partial updates.

Blink component
Blink>DOM

Web Feature ID
Missing feature

Motivation
<template for> allows for server-driven HTML updates. However, the client does not get visibility on errors, speed, and overall flow of these operations. This can lead to bugginess or verbose workarounds.

Initial public proposal
https://github.com/whatwg/html/issues/13008

Goals for experimentation
None



Tracking bug
https://issues.chromium.org/issues/581443722

Estimated milestones

No milestones specified



Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5132879771336704?gate=5156639597527040

This intent message was generated by Chrome Platform Status.
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