Contact emailsmas...@chromium.org

ExplainerNone

Specificationhttps://dom.spec.whatwg.org/#shadowroot-clonable

Summary

This enables individual control over whether a shadow root is clonable (via
standard platform cloning commands such as `cloneNode()`). By default,
declarative shadow roots are clonable. Imperative shadow roots can now be
controlled via a parameter to `attachShadow()`.


Blink componentBlink>DOM>ShadowDOM
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EDOM%3EShadowDOM>

Motivation

None


Initial public proposalNone

Search tagsdeclarative shadow dom
<https://chromestatus.com/features#tags:declarative%20shadow%20dom>

TAG reviewNone

TAG review statusNot applicable

Risks


Interoperability and Compatibility

This is a slight change in behavior, which poses a very small compat risk.
Prior to this feature, only declarative shadow roots within `<template>`
elements would get automatically cloned. With the change, any declarative
shadow root, even in the main page, will get cloned. Safari already shipped
the new behavior, reducing the risk. I plan to enable this functionality
slowly and monitor for breakage and bug reports.


*Gecko*: Positive (https://bugzilla.mozilla.org/show_bug.cgi?id=1868428)
Shipping soon

*WebKit*: Shipped/Shipping (
https://developer.apple.com/documentation/safari-release-notes/safari-17_4-release-notes#Web-API
)

*Web developers*: No signals

*Other signals*:

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?

None


Debuggability

None


Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?Yes

https://wpt.fyi/results/shadow-dom/declarative/clonable.window.html


Flag name on chrome://flagsShadowRootClonable

Finch feature nameShadowRootClonable

Requires code in //chrome?False

Tracking bughttps://crbug.com/1510466

Estimated milestones

No milestones specified


Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5161435196030976

This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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