Bug 221546 – history.back() in a new tab incorrectly loads its parent page in the same tab, instead of closing it

• Status: NEW
• Component: History

Created attachment 419580 [details]
demonstration video of this bug

Safari version: Safari 604.1
iOS version: iOS 14.2


Sample URL:
https://ss1.xrea.com/ango.g3.xrea.com/jkkn/safari_bug2.html


Step to reproduce the issue:
1. Open a new tab via target="_blank"
2. history.back()


Expected results:

history.back() should do nothing (like other browsers) or close the new tab (just like the back button at the bottom left)


Actually results:

history.back() loads its parent page in the same tab, and doesn't close the new tab.
As a result, the tabs look like they are duplicated.
Please check the attached video.


Note: This bug might be related to Issue 8980387:
https://feedbackassistant.apple.com/feedback/8980387

*Note:
This bug might be related to Bug 221547:
https://bugs.webkit.org/show_bug.cgi?id=221547

[Radar WebKit Bug Importer]

<rdar://problem/74347369>

[Smoley]

Thanks for filing, I can reproduce this on iOS 13.6.1 and the latest 14.4 beta.

I wrote another sample code here:
https://ss1.xrea.com/ango.g3.xrea.com/jkkn/safari_bug_sample.html

Please feel free to use this sample in debugging Bug 221546 and Bug 221547.