Contact emailsmas...@chromium.org Explainerhttps://github.com/whatwg/html/pull/5465 https://github.com/whatwg/dom/pull/892
Specificationhttps://github.com/whatwg/html/pull/5465 Summary Chromium has shipped [1] a version of declarative shadow DOM in M90 which currently has 0.014% usage [2]. Mostly, the low usage is due to the spec PR being stalled with no input from other implementers. Recently, there has been renewed interest in the feature, and discussions have resumed. As part of those discussions, two changes have been generally agreed upon: 1. Rename the `<template>` attribute from `shadowroot` to `shadowrootmode`. 2. Support streaming, by attaching the shadow root on the opening, rather than the closing, template tag. While the PR hasn't landed, and there is still an open issue (related to the DOMParser), we would like to ship the agreed upon behavior listed above. WebKit has already enabled this behavior by default <https://github.com/WebKit/WebKit/commit/e7d5dde467956b24438d23f458d4d527f7fd108d>. [1] https://chromestatus.com/feature/5191745052606464 [2] https://chromestatus.com/metrics/feature/timeline/popularity/3196 Blink componentBlink>DOM>ShadowDOM <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EDOM%3EShadowDOM> Search tagsdeclarative <https://chromestatus.com/features#tags:declarative> , shadow <https://chromestatus.com/features#tags:shadow> TAG review TAG review statusNot applicable Risks Interoperability and Compatibility The new version of declarative shadow DOM has observable differences in behavior: streaming. The launch plan is to ship the new behavior via the new attribute name (`shadowrootmode`), while preserving the old behavior under the old attribute name (`shadowroot`). Once the new behavior is landed and stabilized, we will make a plan to deprecate the old shadowroot attribute and behavior. This should ensure that the compat risk is low as we transition to the new behavior. *Gecko*: Positive ( https://github.com/whatwg/html/pull/5465#pullrequestreview-1132523065) *WebKit*: Positive ( https://github.com/whatwg/html/pull/5465#pullrequestreview-1132523065) *Web developers*: Positive (https://github.com/whatwg/dom/issues/831) Search "streaming" on the issue discussion and you'll find many supportive comments. *Other signals*: Ergonomics No difference from existing, shipped declarative shadow DOM implementation. Activation No difference from existing, shipped declarative shadow DOM implementation. Security No difference from existing, shipped declarative shadow DOM implementation. 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? Debuggability No difference from existing, shipped declarative shadow DOM implementation. Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?Yes Is this feature fully tested by web-platform-tests <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md> ?Yes Flag nameStreamingDeclarativeShadowDOM Requires code in //chrome?False Tracking bughttps://crbug.com/1379513 Estimated milestones M111 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). Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5161240576393216 This intent message was generated by Chrome Platform Status <https://chromestatus.com/>. -- 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 blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAM%3DNeDhGHqD6du83UKvRpX-P7ftaG_R8j1pXE-ofqwHGf-sysA%40mail.gmail.com.
