Learning D3.JS 5.0 9.2: Coding a Horizontal Tree

The video tutorial covers the process of coding a horizontal tree diagram. It begins with setting up the HTML and CSS files, followed by declaring data arrays and variables in JavaScript. The tutorial then explains how to append SVG and group elements to the page. It introduces the concept of using a tree map for hierarchical diagrams and concludes with an overview of functions and updates in the code. The focus is on understanding the process rather than providing a perfect example of tree diagram code.

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