Pohon bersarang bahan sudut
<mat-tree>
<mat-nested-tree-node>
parent node
<mat-nested-tree-node> -- child node1 </mat-nested-tree-node>
<mat-nested-tree-node> -- child node2 </mat-nested-tree-node>
</mat-nested-tree-node>
</mat-tree>
Magnificent Meerkat