The Clear-Site-Data http header clears browsing data (cookies, storage, cache) associated with the requesting website.
It allows web developers to have more control over the data stored locally by a browser for their origins.
Clear Site Data is a W3C draft intended to become recommendation:
Support for this is currently missing on WebKit
There are some WPT tests at http://web-platform-tests.live/clear-site-data/
Pull request: https://github.com/WebKit/WebKit/pull/4557
Committed 254745@main (c65efd2b205c): <https://commits.webkit.org/254745@main>
Reviewed commits have been landed. Closing PR #4557 and removing active labels.
Reopening as I am still working on fixing issues and the feature is currently disabled by default.
(In reply to Chris Dumez from comment #5)
> Reopening as I am still working on fixing issues and the feature is
> currently disabled by default.
Unless I'm mistaken, bug 251856 turned it back on, minutes after you posted this comment?