Intent to implement: Support Referrer Policy for <script> elements

[Thomas Nguyen]

Summary: This implementation adds Referrer Policy support to the <script>
element, so it is technically possible to speculatively load script with a
referrerpolicy attribute.

Bug: <https://bugzilla.mozilla.org/show_bug.cgi?id=1330487>
https://bugzilla.mozilla.org/show_bug.cgi?id=1460920

Link to standard: https://github.com/w3c/webappsec-referrer-policy/issues/96

Platform coverage: All platforms.

Estimated or target release: 66

Is this feature enabled by default in sandboxed iframes? Yes.

DevTools bug: There is already a general DevTools bug which allows to
display referrer policy for a given request, see:
https://bugzilla.mozilla.org/show_bug.cgi?id=1496742

Do other browser engines implement this? Chromium, see:
https://www.chromestatus.com/feature/5227651627220992

Is this feature restricted to secure contexts? No.

Web-platform-tests: Yes; currently disabled in our codebase

https://searchfox.org/mozilla-central/search?q=script-tag%2Finsecure-protocol.keep-origin-redirect.http.html&path=

[James Graham]

Post by Thomas Nguyen
Summary: This implementation adds Referrer Policy support to the <script>
element, so it is technically possible to speculatively load script with a
referrerpolicy attribute.
Web-platform-tests: Yes; currently disabled in our codebase
https://searchfox.org/mozilla-central/search?q=script-tag%2Finsecure-protocol.keep-origin-redirect.http.html&path=

I can't see from the search where the tests are disabled, but I do
remember there were some problems with those referrer policy tests in
the past, so maybe I am overlooking something. In any case I presume we
will ensure that they are working as part of the implementation work?

Do we have any idea of whether the existing tests provide sufficient
coverage of the feature?

[Thomas Nguyen]

The link
https://searchfox.org/mozilla-central/search?q=script-tag%2Finsecure-protocol.keep-origin-redirect.http.html&path=
is not covered all the tests. Thanks James for pointing it out.
In fact, we have synced all script-tag tests which were added in
https://github.com/web-platform-tests/wpt/pull/10976/commits/78a3837eb9cc4fb1bd55f21a9823eda82694d3d2
The tests should provide sufficient coverage of the feature. All the tests
are disabled now, for example:
https://searchfox.org/mozilla-central/source/testing/web-platform/meta/referrer-policy/no-referrer/attr-referrer/cross-origin/http-http/script-tag
https://searchfox.org/mozilla-central/source/testing/web-platform/tests/referrer-policy/no-referrer/attr-referrer/cross-origin/http-http/script-tag
https://searchfox.org/mozilla-central/source/testing/web-platform/meta/referrer-policy/origin/attr-referrer/cross-origin/http-http/script-tag
https://searchfox.org/mozilla-central/source/testing/web-platform/meta/referrer-policy/origin/attr-referrer/same-origin/http-http/script-tag

Post by Thomas Nguyen

Post by Thomas Nguyen
Summary: This implementation adds Referrer Policy support to the <script>
element, so it is technically possible to speculatively load script with

a

Post by Thomas Nguyen
referrerpolicy attribute.
Web-platform-tests: Yes; currently disabled in our codebase

https://searchfox.org/mozilla-central/search?q=script-tag%2Finsecure-protocol.keep-origin-redirect.http.html&path=
I can't see from the search where the tests are disabled, but I do
remember there were some problems with those referrer policy tests in
the past, so maybe I am overlooking something. In any case I presume we
will ensure that they are working as part of the implementation work?
Do we have any idea of whether the existing tests provide sufficient
coverage of the feature?
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[James Graham]

Post by Thomas Nguyen
The link
https://searchfox.org/mozilla-central/search?q=script-tag%2Finsecure-protocol.keep-origin-redirect.http.html&path=
is not covered all the tests. Thanks James for pointing it out.
In fact, we have synced all script-tag tests which were added in
https://github.com/web-platform-tests/wpt/pull/10976/commits/78a3837eb9cc4fb1bd55f21a9823eda82694d3d2
The tests should provide sufficient coverage of the feature. All the

It looks like the tests are marked as expected: FAIL rather than
disabled, and checking treeherder I'm finding results so I think they
are indeed already running (sorry if this is a bit pedantic, I was just
making sure I understood the situation).

[Thomas Nguyen]

Oh, you are right, sorry that I used confusing words. After implementation,
we expect they are all passed as OK, not FAIL.

Post by Thomas Nguyen

Post by Thomas Nguyen
The link

https://searchfox.org/mozilla-central/search?q=script-tag%2Finsecure-protocol.keep-origin-redirect.http.html&path=

Post by Thomas Nguyen
is not covered all the tests. Thanks James for pointing it out.
In fact, we have synced all script-tag tests which were added in

https://github.com/web-platform-tests/wpt/pull/10976/commits/78a3837eb9cc4fb1bd55f21a9823eda82694d3d2

Post by Thomas Nguyen
The tests should provide sufficient coverage of the feature. All the

It looks like the tests are marked as expected: FAIL rather than
disabled, and checking treeherder I'm finding results so I think they
are indeed already running (sorry if this is a bit pedantic, I was just
making sure I understood the situation).