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Ddassermouna
Last edited Jul 18, 2021
Created on Jul 18, 2021

This interactive tree diagram visualizes U.S. permanent visa categories and subcategories from a JSON dataset, with nodes collapsed by default and expandable via clicks. It uses D3 v3’s `d3.layout.tree` and `d3.svg.diagonal` for the positional layout and curved links, rendered as SVG with animated transitions (`transition().duration()`) that move nodes and paths smoothly between states. Node styling distinguishes collapsed nodes with lightsteelblue circles, while the hierarchy’s depth is normalized vertically at 180-pixel increments.

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