Firefox 144 added ShadowRoot.referenceTarget behind pref#29261
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hamishwillee wants to merge 3 commits intomdn:mainfrom
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Firefox 144 added ShadowRoot.referenceTarget behind pref#29261hamishwillee wants to merge 3 commits intomdn:mainfrom
ShadowRoot.referenceTarget behind pref#29261hamishwillee wants to merge 3 commits intomdn:mainfrom
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hamishwillee
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Mar 16, 2026
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caugner
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ShadowRoot.referenceTarget behind pref
caugner
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Mar 27, 2026
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FF144 made a bunch of changes to support
ShadowRoot.referenceTarget,HTMLTemplateElement.shadowRootReferenceTargetand the corresponding attribute on the<template>element, and a new option to set this in `Element.attachShadow() in https://bugzilla.mozilla.org/show_bug.cgi?id=1981341.The spec changed slightly, and in FF149 it made the new additions nullable (which has no effect on a preferenced-only BCD feature).
The PR #28570 added some of these, but incorrectly indicated FF149 for FF support. It also missed the
attachShadow()option andHTMLTemplateElement.shadowRootReferenceTarget.Explainer for the thing here https://github.com/WICG/webcomponents/blob/gh-pages/proposals/reference-target-explainer.md
For FF I have updated to match the FF IDL. For Safari and Chrome I have copied the pattern of the features that were recorded - so exactly the same preferences and versions. I am making the assumption that these are implemented, because why wouldn't you.
FYI @meyerweb
Related docs work can be tracked in mdn/content#43453