#3899 Slider options for web

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30503 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3906 replaced position.ABSOLUTE to RELATIVE. Should work with z-index.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30504 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3904: avoid recomputations + cleanup

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30505 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3906 replaced position.ABSOLUTE to RELATIVE. Should work with z-index.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30506 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e