<!DOCTYPE html> <head> <meta charset="UTF-8"> <link href="https://fonts.googleapis.com/css?family=Open+Sans:600" rel="stylesheet"> <link href="style.css" rel="stylesheet"> </head> <body> <form id="insertTree" onSubmit="return handleInsert()"> <input id="insertInput" type="text" placeholder="Number to insert" maxlength="4" size="14" autofocus> <input type="submit" value="Insert"> </form> <form id="deleteTree" onSubmit="return handleDelete()"> <input id="deleteInput" type="text" placeholder="Number to delete" maxlength="4" size="14"> <input type="submit" value="Delete"> </form> <svg></svg> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script> <script src="https://d3js.org/d3.v4.min.js"></script> <script src="tree-creation.js"></script> <script src="tree-visualization.js"></script> </body>