<!DOCTYPE html>
<html lang="en">
<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>Sketch</title>
</head>
<body>
  <script type="module">
    import {pen, put, left, right, forward, render} from './lib/doodle.js';
    
    pen(1, '#3a7');
    put(0, -1);
    left(90);
    forward(1);
    function tree(depth) {
      const l = 0.1;
      if(depth <= 0) return;
      forward(l);
      tree(d