Remove "noopener" from wp_list_bookmarks() output

[audrasjb]

Introduced in [52061].

As stated in [59120], we should remove noopener relation value from wp_list_bookmarks().

Since this was introduced, supported browsers have changed their security policies and no longer allow the opened link to have JavaScript access to the previous tab.

To easily reproduce the issue:

• Install the Link Manager legacy plugin and a theme that supports Widgets, like Twenty Twenty
• Add some links using target="blank setting on them
• Add a Link widget to a widget area
• Confirm that the link has a noopener attribute

https://core.trac.wordpress.org/ticket/63096

[marineevain]

target blank before patch

[marineevain]

target blank after patch

[marineevain]

Hi everyone,

I just tested the patch and it appears to work fine. I compared between current version on my "sandbox" WP website (Twenty-Nineteen theme) + Link Manager plugin. I did the same on the Playground test link (with Twenty-Twenty them + same plugin) and you can find attached the screenshots showing the difference.
Thanks for the patch!

[jeremy80]

Hi,

I just tested, before the patch (with Twenty Twenty on my local) and after the patch (Twenty Seventeen on Playground).

"noopener" before the patch on the target="_blank" link and no more "noopener" after the patch on the target="_blank" link. So it's all good :)

[audrasjb]

Moving for 6.8 consideration

[audrasjb]

In 60058:

General: Remove noopener from links opening in a new tab in wp_list_bookmarks().

This changeset removes the automatic addition of rel="noopener" from links targeting a new tab via target="_blank" in the wp_list_bookmarks() function. Since this was introduced, supported browsers have changed their security policies and no longer allow the opened link to have JavaScript access to the previous tab. This also removes the unit test cases previously located in wpListBookmarks.php as they were dedicated to test the presence of rel="noopener".

Follow-up to [52061], [59120].

Props audrasjb, rvouill, marineevain, jeremy80.
Fixes #63096.