The mrk sub-module provides a MarkupModel that can be used to add markup items to a visualization. Markup items can be labels, triangles with and without textures and points.
The Markup model is usually used to add markup items to a given model (geo, usg, ug).
Assuming that the EnvisionWeb client component has been imported into the variable
cee, members of the markup module may be referenced using the
cee.mrk prefix, e.g.:
var model = new cee.mrk.MarkupModel();