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We need to understand very well how these work in shadow DOM subtrees.
http://dvcs.w3.org/hg/webcomponents/rev/3fb19f98bead This is not entirely satisfactory, since the spec currently states that content in shadow DOM subtree may never be retrieved using window.getSelection(). However, I don't know how to fix that at the moment. Also, shadow DOM clearly calls for multiple-range selection, but there be dragons. Bug 15444 filed to track fixing this.