u1-tree1 {
    display:block;
}
u1-tree1::part(row) {
    cursor:pointer;
}
u1-tree1::part(row):focus {
    outline:1px dotted black;
}
u1-tree1[aria-selected=true]::part(row) {
    background:#00000008;
}
u1-tree1[draggable]::part(row) {
    cursor:grab;
}


u1-tree1:not(:defined) {
    visibility: hidden;
}