List UI using HTML

does someone know how to specify the height of the each line in a list widget using html?

You can set height “auto” for list items (type property) and define the height via template:

{
    view: "list",
    template: function(obj){
	return "<div style='height:"+(obj.id%2?50:20)+"px'>"+obj.title+"</div>"
    },
    type:{
	height: "auto"
    },
...
}