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This alerts "No exception" in both Gecko and WebKit: data:text/html,<!doctype html> <script> try { document.createRange().isPointInRange(document.createElement("a"), 0); throw "No exception"; } catch(e) { alert(e) } </script> alerts "No exception" for me in both Gecko and WebKit. I'll write tests for this, and update the spec to match browser results. Assuming I don't forget.
http://dvcs.w3.org/hg/domcore/rev/e4ce1db482f8 http://dvcs.w3.org/hg/webapps/rev/4c3d54f4198d