To reproduce: 1. data:text/html,%3Cbody%20style=%22background-image:url(http://www.webkit.org/images/download.png);%20background-attachment:fixed%22%3E%3Cdiv%20style=%22background-color:white;%20width:400px;height:400px%22%3EScroll%20this%20page%20and%20watch%20the%20background%20stay%20in%20place 2. Scroll far enough to trigger rubber-banding The body's background stays in place, rather than obeying the rubber-banding.
<rdar://problem/8977629>
Created attachment 181236 [details] Patch
http://trac.webkit.org/changeset/138757