It appears that when you use the prototype object to assign custom methods to event handlers (in this instance `onload`), Safari incorrectly reassigns the `this` keyword to `Window`, when it should reference the object you initially assigned the method to.
In Safari (1.3 and 2+) the onload function will alert the `Window` object when one would expect it alert `Image`.
Test page Workaround is not included
Reported by: Tom Biegeleisen.
Safari | Reported on 3 April 2007.
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1 Posted by Mark Rowe on 28 May 2007 | Permalink
As the test case mentions, this has been fixed in recent builds of WebKit.