THtmlSpreadView.HotTrack Property
You can set the properties inside so the cells will highlight when the mouse is over them. Note that tracking the columns will increase the size of the generated file. On the ohter hand, tracking the rows and cells will not increase the file size. No javascript is used for the tracking, only CSS.
Syntax
Namespace: FlexCel.Render
public THtmlHotTrack HotTrack { get; }