This visual filter is used for creating symmetrically mirrored copies of an element flipped on the horizontal axis. There are no properties to use with it.
The use of this filter is now deprecated in favor of the BasicImage() filter that was implemented with the IE 5.5 browser. You can also use the Matrix() filter in place of this.
Filters are defined in style sheets as if they were a function call with its arguments expressed as name=value pairs. This is not the typical way to define arguments so you should be aware of this anomaly when working with filters.