[Webkit-unassigned] [Bug 233876] New: History intervention to prevent Back button abuse

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233876

            Bug ID: 233876
           Summary: History intervention to prevent Back button abuse
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ajuma at chromium.org
                CC: achristensen at apple.com, beidson at apple.com,
                    bfulgham at webkit.org, cdumez at apple.com

Some websites abuse the History API to inject history entries that break the Back button.

For example, on Safari on iOS 15.1:
1. Visit google.com and search for "PVR Silver Arc"
2. Tap on "Website" in the search result box for "PVR Silver Arc".
3. Tap on the back button to try to return to the search results page.

Actual result:
The site has inserted an entry into the back/forward list so no matter how many times you tap on the back button, you stay on this site.

Blink and Gecko have shipped an intervention to prevent this kind of abuse. This marks entries added to the Back/Forward list without user action so that they're skipped when tapping on the Back button.
WICG: https://github.com/WICG/interventions/issues/21
Blink bug: https://bugs.chromium.org/p/chromium/issues/detail?id=907167
Gecko bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1515073

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