In Chrome ⋹̸ and ⋵̸ are converted to ¬inE; and ¬indot; but according to http://www.w3.org/2003/entities/2007/htmlmathml-f.ent the following values should be used: <!ENTITY notinE "⋹̸" ><!--ELEMENT OF WITH TWO HORIZONTAL STROKES with slash --> <!ENTITY notindot "⋵̸" ><!--ELEMENT OF WITH DOT ABOVE with slash --> I tested both Chrome 11.0.696.71 Windows and Chrome 10.0.648.205 Linux.
More generally, we need to update our list of entities because the spec changed after we implemented it. We need to add support for entities that consist of more than on character. (Most of the support is there, but the code generator needs to be taught about them.)
This seems to be fixed in the latest release of Chrome. It is not in the latest release of Safari but I guess the fix should come soon.