far as I can tell, these would depend on support from some specification, and
the only code on the web which mentions them are duplicate copies of OpenLayers
documentation.
We should probably remove these from the corresponding style blocks as well.
git-svn-id: http://svn.openlayers.org/trunk/openlayers@8752 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf