[Webkit-unassigned] [Bug 226323] New: [iOS 14.5/Safari 14] Can't go back and render previous page properly after "location.href"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226323

            Bug ID: 226323
           Summary: [iOS 14.5/Safari 14] Can't go back and render previous
                    page properly after "location.href"
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: History
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: okamoto.takuya.ot at gmail.com

Created attachment 429863

  --> https://bugs.webkit.org/attachment.cgi?id=429863&action=review

reproducing steps

# Reproducible environment

- Safari and Webview on iOS 14.5
- Safari 14.1 on Mac 10.15

# Reproducing steps

Please see the attached video, too.

1. Access to SiteA located in "https://siteA.com/"
2. In SiteA, run JS code like this immediately:
```
<script type="text/javascript">
  location.href="https://siteB.com/" // SiteB
</script>
```

This page of SiteA won’t be recorded in the browser’s history since this "location.href" is called without user interactions.
https://html.spec.whatwg.org/multipage/history.html#location-object-setter-navigate

3. After arriving at SiteB, click browser's history back button to go back to SiteA
4. I expected to see the page before SiteA, but the issue below occurs

# Issue

Even though the browser's URL bar shows SiteA's URL, but I can't see SiteA contents because:
- The browser shows a blank screen instead (iOS)
- Or, the browser keeps and shows previous page's contents of SiteA (Mac)

## Note

- When SiteA and SiteB are on a same domain, this issue isn't reproduced.
- Sometimes the issue won't occur anymore after accessing SiteA multiple times. In that case, once clear the browser cache, you can reproduce it again.

# Reproducible page

page: https://redirect-issue.web.app
code: https://github.com/cola119/safari-redirect-issue

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