not sure why these directives were not added in #49306, maybe they were added to the documentation afterwards

/cc @maxbeckers

Those ones are new experimental features in browsers (see the "experimental" icons in https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Clear-Site-Data#directives).
They have not just been added later in the documentation, but also in the spec.

We currently already support the executionContexts directive which is also experimental. Though if they were later added to the spec I'd also be fine to add this as a new feature.

We currently already support the executionContexts directive which is also experimental.

This one is experimental since more time 😄

rebased and relabeled so that we can merge it once we start the development of 8.1

(rebase needed though)

Thank you @xabbuh.