It looks like this was removed from the spec here <https://github.com/WICG/local-network-access/commit/314cb7ad46d6c10a9498551a445a7cd7f3cfbc0c>, so I've added that as the spec link.
Please request the additional reviews required for deprecation and removal (we upgraded the chromestatus entry from just 'plan' to a full removal since it appears that's what you're asking for). I assume this will have a killswitch, just in case some enterprise was somehow relying on it or something, right? LGTM2 conditional on the above. Rick On Wed, Oct 7, 2026 at 5:20 PM Chris Harrelson <[email protected]> wrote: > LGTM1 > > On Wed, Sep 30, 2026 at 12:25 PM Hubert Chao <[email protected]> wrote: > >> One thing that may not be clear: the plan here is to remove the header >> directly without a deprecation trial. >> On Wednesday, September 30, 2026 at 3:22:59 PM UTC-4 Chromestatus wrote: >> >>> *Contact emails* >>> [email protected] >>> >>> *Explainer* >>> *No information provided* >>> >>> *Specification* >>> *No information provided* >>> >>> *Summary* >>> The Content Security Policy header treat-as-public-address was added as >>> part of Private Network Access to allow non-documents to declare themselves >>> as being in the public address space ( >>> https://wicg.github.io/private-network-access/#csp). It is primarily >>> useful for testing. >>> https://github.com/WICG/private-network-access/issues/88 highlights >>> some issues with this header, and the decision was made to remove this >>> header instead of moving it somewhere else. For testing use cases, the >>> --ip-address-space-overrides command line flag can be used. This header was >>> only ever implemented in Chromium; Firefox has never implemented this >>> header and has no plans to. Safari has not implemented Private Network >>> Access or Local Network Access and so does not have the header either. >>> >>> *Blink component* >>> Blink > SecurityFeature > LocalNetworkAccess >>> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%20%3E%20SecurityFeature%20%3E%20LocalNetworkAccess%22> >>> >>> *Web Feature ID* >>> local-network-access >>> <https://webstatus.dev/features/local-network-access> >>> >>> *Motivation* >>> Header does not fit well into Content Security Policy, and it was deemed >>> unnecessary given the alternative of using `--ip-address-space-overrides` >>> Metrics show this is barely used: >>> https://chromestatus.com/metrics/feature/timeline/popularity/5983 >>> >>> *Initial public proposal* >>> *No information provided* >>> >>> *Goals for experimentation* >>> None >>> >>> *Debuggability* >>> *No information provided* >>> >>> *Requires code in //chrome?* >>> False >>> >>> *Tracking bug* >>> https://issues.chromium.org/issues/527730705 >>> >>> *Estimated milestones* >>> >>> No milestones specified >>> >>> >>> *Link to entry on the Chrome Platform Status* >>> https://chromestatus.com/feature/5187021965492224?gate=5964820426915840 >>> >>> 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 [email protected]. >> To view this discussion visit >> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/80795d4e-33ef-4636-a047-c3d289026300n%40chromium.org >> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/80795d4e-33ef-4636-a047-c3d289026300n%40chromium.org?utm_medium=email&utm_source=footer> >> . >> > -- > 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/CAOMQ%2Bw_a76_7KM6HyPbs%3DkLyWiLZ7bK%2BUUv6GjVJdgFUqCFvGw%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOMQ%2Bw_a76_7KM6HyPbs%3DkLyWiLZ7bK%2BUUv6GjVJdgFUqCFvGw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- 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/CAFUtAY8D-X6h_bvJcpA01jQfo%2Bk5zHrJyyDH5AU0ho0v83-8Hg%40mail.gmail.com.
