type

defines the layout borders

string type;

"line"

cells with a border

"clean"

cells without a border

"wide"

cells with a border and wide space between siblings

"space"

cells with a border and wide space between siblings plus padding from the parent container

"form"

cells without a border and with padding around all of them

webix.ui({
    type: "space",
    rows: [
      ...
    ]
});

"toolbar"