JS spreadsheet webcomponent

How to create a JS spreadsheet webcomponent using JSS.

by Spreadsheet Online

HTML

<script src="https://jspreadsheet.com/v11/jspreadsheet.js"></script>
<script src="https://jsuites.net/v5/jsuites.js"></script>

<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Material+Icons" />

<j-spreadsheet toolbar="true"></j-spreadsheet>

JavaScript

class Jspreadsheet extends HTMLElement {
    constructor() {
        super();
    }

    init(o) {
        // Shadow root
        const shadowRoot = this.attachShadow({mode: 'open'});

        // Style
        const css = document.createElement('link');
        css.rel = 'stylesheet';
        css.type = 'text/css'
        css.href = 'https://cdn.jsdelivr.net/npm/jspreadsheet/dist/jspreadsheet.min.css';
        shadowRoot.appendChild(css);

        const cssJsuites = document.createElement('link');
        cssJsuites.rel = 'stylesheet';
        cssJsuites.type = 'text/css'
        cssJsuites.href = 'https://cdn.jsdelivr.net/npm/jsuites/dist/jsuites.min.css';
        shadowRoot.appendChild(cssJsuites);

        const cssMaterial = document.createElement('link');
        cssMaterial.rel = 'stylesheet';
        cssMaterial.type = 'text/css'
        cssMaterial.href = 'https://fonts.googleapis.com/css?family=Material+Icons';
        shadowRoot.appendChild(cssMaterial);

        // JSS container
        var container = document.createElement('div'); 
        shadowRoot.appendChild(container);

        // Properties from the web-component
        var toolbar = this.getAttribute('toolbar') == "true" ? true : false;

        // Set the license
       ...