This interactive tree visualizes question-answering outcomes, starting from a "Faced Questions" root that branches into Visit/Not Visit, Attempted/Not Attempted, and Correct/Incorrect paths, each colored by status. Clicking a node collapses or expands its subtree, while dragging attempts deletion. Built with D3 v5, it uses `d3.tree` for layout, `d3.hierarchy` for data binding, `d3.linkHorizontal` for edges, and SVG elements with zoom support via `d3.zoom`. Transitions animate node positions and opacity changes over 100ms durations.