[Webkit-unassigned] [Bug 135009] New: assign undefined value to Element property throws TypeError

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=135009

           Summary: assign undefined value to Element property throws
                    TypeError
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: iOS
        OS/Version: Other
            Status: NEW
          Severity: Major
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: huge.huang+webkitbug at gmail.com


Prior to iOS8 Safari / Safari 8.0 if we assign undefined to Element property (like document.body.scrollTop) it fallback to 0

```js
document.body.scrollTop = undefined;

TypeError: Type error
column: 110
line: 1
message: "Type error"
stack: "eval code↵eval@[native code]↵_evaluateOn↵_evaluateAndWrap↵evaluate"
__proto__: Error
```

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