an object that specifies items presentation
list = webix.ui({
    view:"list",
    type:{
        height:50
    }
});
It is possible to create a type object separately and then refer to it by its name:
webix.type(webix.ui.dataview,{
    name:"typeA",
    width: 260,
    height: 90
});
 
webix.ui({
    view:"dataview",
    type:"typeA"
});
Related sample: Named Templates
More information about Type Implementation can be found in a separate article of the main documentation.