<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Markmap</title>
<style>
* {
  margin: 0;
  padding: 0;
}
#mindmap {
  display: block;
  width: 100vw;
  height: 100vh;
}
</style>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/markmap-toolbar@0.2.0/dist/style.min.css">
</head>
<body>
<svg id="mindmap"></svg>
<script src="https://cdn.jsdelivr.net/npm/d3@6.7.0"></sc