In a similar fashion to bug 1503681, we would like to experiment with breaking opener references for pages opened via form navigations. On the related dev-platform thread, I said this about the spec side of things: ...it's impossible to block opener reference creation upon form submission right now as far as I can tell. This is actually a bug in the spec. <https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#form-submission-algorithm:the-rules-for-choosing-a-browsing-context-given-a-browsing-context-name> calls into "rules for choosing a browsing context" passing only two arguments, omitting the third one (noopener) <https://html.spec.whatwg.org/multipage/browsers.html#the-rules-for-choosing-a-browsing-context-given-a-browsing-context-name>. The web compat risk here is unknown so it may make sense to land a pref that we can turn on first on Nightly and take things from there.
Might require some docs updates somewhere along the line.
8 months ago
Summary: Make <form target="_blank"> imply noopener behaviour → Add support for <form rel>
See Also: → https://bugs.webkit.org/show_bug.cgi?id=194398
Component: HTML: Form Submission → DOM: Core & HTML
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