[Webkit-unassigned] [Bug 169787] New: Allow setting the prototype of cross-origin objects, as long as they don't change

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169787

            Bug ID: 169787
           Summary: Allow setting the prototype of cross-origin objects,
                    as long as they don't change
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Bindings
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d at domenic.me
                CC: cdumez at apple.com

A recent spec tweak made WindowProxy and Location consistent with Object.prototype in the ECMAScript spec, in that you are allowed to set their prototype as long as you don't *change* it. Safari Tech Preview implements the spec perfectly before this tweak; sorry to change this from under you.

The following web platform tests should cover the new behavior exhaustively:

- WindowProxy
  - http://w3c-test.org/html/browsers/the-windowproxy-exotic-object/windowproxy-prototype-setting-cross-origin-domain.sub.html
  - http://w3c-test.org/html/browsers/the-windowproxy-exotic-object/windowproxy-prototype-setting-cross-origin.sub.html
  - http://w3c-test.org/html/browsers/the-windowproxy-exotic-object/windowproxy-prototype-setting-goes-cross-origin-domain.sub.html
  - http://w3c-test.org/html/browsers/the-windowproxy-exotic-object/windowproxy-prototype-setting-same-origin-domain.sub.html
  - http://w3c-test.org/html/browsers/the-windowproxy-exotic-object/windowproxy-prototype-setting-same-origin.html
- Location
  - http://w3c-test.org/html/browsers/history/the-location-interface/location-prototype-setting-cross-origin-domain.sub.html
  - http://w3c-test.org/html/browsers/history/the-location-interface/location-prototype-setting-cross-origin.sub.html
  - http://w3c-test.org/html/browsers/history/the-location-interface/location-prototype-setting-goes-cross-origin-domain.sub.html
  - http://w3c-test.org/html/browsers/history/the-location-interface/location-prototype-setting-same-origin-domain.sub.html
  - http://w3c-test.org/html/browsers/history/the-location-interface/location-prototype-setting-same-origin.html

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