Thanks for tackling this important feature! On Tuesday, May 26, 2026 at 4:17:50 PM UTC+2 Noam Rosenthal wrote:
Contact emails [email protected], [email protected], [email protected] Explainer https://github.com/WICG/declarative-partial-updates/ blob/main/patching-explainer.md Specification https://github.com/whatwg/html/pull/11818 What's preventing the PR from landing? Summary Use <template for> and processing instruction ranges (<?start> and <?end>, or <?marker) to update existing parts of the document without JS. Blink component Blink>HTML Web Feature ID No information provided Motivation Out of order streaming and partial updates are primitives that have been part of userland libraries for about a decade. Initial public proposal https://github.com/WICG/declarative-partial-updates TAG review https://github.com/w3ctag/design-reviews/issues/1134 TAG review status Issues addressed Goals for experimentation None Risks Interoperability and Compatibility The main compat risk is re-introducing processing instructions, that were parsed as comments up until now. This is mitigated by disallowing HTML parsing of known processing instructions like <?xml-stylesheet?>, and avoiding special characters like $. It was heavily tested against the HTTP archive and ran in 50% Finch in beta. If new compat issues arise we can special-case particular processing instruction targets but it's likely not going to be necessary. Gecko: Proposed support (https://github.com/mozilla/standards-positions/issues/1369) WebKit: Support (https://github.com/WebKit/standards-positions/issues/628) Web developers: Positive (https://github.com/wicG/declarative-partial-updates) See issues in the WICG repo, lots of involvement from framework/CMS developers. There were some mixed reviews on some threads (e.g. https://news.ycombinator.com/item?id=48252957#48262499) Other signals: Enthusiasm (see the WICG repo) from frameworks and CMS like WordPress. Drupal already has an open issue to support this (https://www.drupal.org/project/drupal/issues/3590980) WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? No Debuggability No information provided Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)? Yes Is this feature fully tested by web-platform-tests? Yes https://wpt.fyi/results/html/dom/partial-updates/tentative? label=experimental&aligned Flag name on about://flags None Finch feature name DocumentPatching Rollout plan Will ship enabled for all users Requires code in //chrome? False Tracking bug https://issues.chromium.org/issues/431374376 Estimated milestones Shipping on desktop150 DevTrial on desktop148 Shipping on Android150 DevTrial on Android148 Shipping on WebView150 Anticipated spec changes Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way). There are a couple of small issues on the spec PR (e.g. how processing instruction attributes are parsed) but they are converging and the difference shouldn't be consequential. Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5111042975465472?gate=5152413073539072 Links to previous Intent discussions Intent to Prototype: https://groups.google.com/a/chromium.org/d/msgid/blink- dev/6870fd9f.2b0a0220.2125de.0151.GAE%40google.com This intent message was generated by Chrome Platform Status. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/a0144c0c-3a85-4f3f-87d1-520e55887a10n%40chromium.org.
