LayoutTests/fast/frames/cross-site-this.html fails in Chrome, Safari 3.2 and FF 3.1 beta 1. It looks like is testing wrong thing: In resources/cross-site-this-helper.html: var eff = parent.foo; eff(this); the default receiver passed to eff, this, is the current frame in FF Safari 3.2 and Chrome. The comment seems wrong. Can you verify with other browsers?