[Webkit-unassigned] [Bug 165412] New: top.location.assign is undefined inside non-sandboxed iframe on different origin

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165412

            Bug ID: 165412
           Summary: top.location.assign is undefined inside non-sandboxed
                    iframe on different origin
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: iPhone / iPad
                OS: iOS 10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mkhatib727 at gmail.com

top.location.assign is undefined inside an iframe. For example,

top: https://hello.com
  iframe: https://whatsapp.com
     script loaded from: https://whatsapp.com
        executes -> window.top.location.assign('https://whatever.com') // <- .assign is undefined and throws a security error
        executes -> window.top.location.replace('https://whatever.com') // <- .replace is NOT undefined and works as expected
        executes -> window.top.location.href = 'https://whatever.com' // <- works as expected


Errors thrown by .assign:
window.top.location.assign is not a function. (In 'window.top.location.assign(url)', 'window.top.location.assign' is undefined)
Blocked a frame with origin 'https://whatsapp' from accessing a frame with origin 'https://hello.com'. Protocols, domains, and ports must match.

The expected behavior is that .assign would still work in non-sandboxed iframes - similar to replace.

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