List of attributes and methods of window object: Opera 10 does not support prop in window call.

Actual results: Opera 10 message error console will report that the window object does not support "property in [object]" call: "message: Statement on line 18: The Object does not implement [[Call]]"

Note: MSIE 6, MSIE 8, Seamonkey 1.x, Firefox 2.x, Firefox 3.x render this demo page accordingly.