[webkit-dev] Same-Site cookies by default

John Wilander wilander at apple.com
Fri Mar 6 18:51:26 PST 2020

Hi Patrick!

Thanks for bringing this up. I’ll share my view of where we are.

First of all, cookies mostly live in the http layer so the various WebKit ports would have to work this out independently to some extent. Maybe libcurl and libsoup have readily available APIs for this?

Second, we have communicated tentative support for SameSite=lax by default, but in terms of its privacy protections, WebKit is far ahead with its Intelligent Tracking Prevention (ITP, or Resource Load Statistics in open source). Servers that expect to get default third-party cookie access merely through a SameSite=none; Secure configuration will find that such an option does not exist under ITP. Instead, third-parties who need cookie access can make use of the Storage Access API which gives users control and transparency.

Finally, as far as I know, Chrome is still the only browser to try out SameSite=lax plus forced TLS for SameSite=none and they seem to be at 10% rollout at this moment. We’d like to hear some lessons learned from them since it may be a tough rollout, at least for a browser that has historically allowed all cookies in third-party contexts by default. Safari is among a few browsers that has not allowed that. I do not know what default cookie policies the other WebKit browsers have.

   Regards, John

> On Mar 6, 2020, at 1:07 PM, Patrick Griffis <pgriffis at igalia.com> wrote:
> Chromium has had the idea to treat all cookies as SameSite=Lax by
> default as well as blocking SameSite=None over HTTP for a while now,
> hidden behind a flag, and seem to be rolling this out soon.
> The topic is discussed in detail here:
> https://web.dev/samesite-cookies-explained/#changes-to-the-default-behavior-without-samesite
> I just wondered if other developers had any thoughts on this move and
> if/when WebKit should follow. The downside is of course compatibility
> but the upside is improved privacy.
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