Form with target=_blank and opener relationship

[cdumez]

I was investigating the following WPT test:
html/semantics/forms/form-submission-target/rel-input-target.html

In particular, the first subtest uses <form rel=""> and a button that looks like <input type=submit formtarget=_blank>.

I would have expected the new window to NOT have an opener since target is _blank and rel does not include opener.
However, the test seems the expect an opener here. Is this a bug in the test or am I misunderstanding the specification?

The relevant specification text seems to be:

• https://html.spec.whatwg.org/multipage/links.html#get-an-element's-noopener

which is called from:

• https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#form-submission-algorithm:get-an-element's-noopener

[cdumez]

cc @annevk @domenic

[cdumez]

Similarly, the following tests use a

with target="_blank" and do not have rel="opener", yet they expect the popup to have an opener:

• content-security-policy/form-action/form-action-self-allowed-target-blank.html
• content-security-policy/form-action/form-action-src-allowed-target-blank.sub.html
• content-security-policy/form-action/form-action-src-redirect-allowed-target-blank.sub.html

[annevk]

I suspect the problem is that this hasn't been implemented yet.

Firefox still has https://bugzilla.mozilla.org/show_bug.cgi?id=1509346.

That pointed to web-platform-tests/wpt#15356 for tests I wrote so I suspect we're in an inconsistent state on WPT.

[Kaiido]

Note that there seems to be a typo in https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#form-submission-algorithm:get-an-element's-noopener targetAttributeValue is undefined, I guess this should read target.

[annevk]

Created web-platform-tests/wpt#31368 and #7258 to address these. Review appreciated.

[cdumez]

Thank you for updating the tests. I am updating WebKit's behavior accordingly via https://bugs.webkit.org/show_bug.cgi?id=232243.