Fixed a bug relating to custom-elements's first vnode where render(){ return <div class="example" /> } would set the example-class on the custom-element itself.

Added support for className and style similar to react
Cleaned up some comments
Reworked how tests are built in order to add a new test "pdf" which was a small side-project where previous mentioned bug showed up, it's an example using HTML to create a PDF for printing

tests/pdf/index.jsx

@@ -0,0 +1,88 @@
+import kaartStyle from "./index.pcss";
+import {render, defineElement, CustomElement, Host, State, Prop, ShadowDOM} from "../../packages/csx";
+
+// Style
+document.head.appendChild(render(<style>{kaartStyle}</style>));
+
+// Kaart
+@defineElement("pasta-buffet-kaart")
+class PastaBuffetKaart extends CustomElement{
+    
+    @Prop() eigenExemplaar;
+    
+    render(){
+        return <div className="kaart">
+            <div className="header">
+                <img src="assets/logo.svg" alt={"logo"} className="logo"/>
+                <div className="header-info">
+                    <div className="title">Pastabuffet</div>
+                    <div className="sub-title">Zondag 02/02/2020 vanaf 17u</div>
+                    <div className="sub-title">O.C De Link, Linkhoutstraat 194</div>
+                </div>
+            </div>
+            <div className="content">
+                <h3>Bestelling</h3>
+                <table className="order">
+                    <tr>
+                        <td className="product-name">Volwassenen</td>
+                        <td className="product-amount"><input type="text"/></td>
+                        <td className="product-multiplier">x</td>
+                        <td className="product-price">14,00€ =</td>
+                        <td className="product-total"><input type="text"/></td>
+                    </tr>
+                    <tr>
+                        <td className="product-name">Kinderen</td>
+                        <td className="product-amount"><input type="text"/></td>
+                        <td className="product-multiplier">x</td>
+                        <td className="product-price">8,00€ =</td>
+                        <td className="product-total"><input type="text"/></td>
+                    </tr>
+                    <tr>
+                        <td colSpan={3}/>
+                        <td className="total-label">Totaal =</td>
+                        <td className="order-total"><input type="text"/></td>
+                    </tr>
+                </table>
+        
+                <table className="account">
+                    <tr>
+                        <td className="product-name">Naam</td>
+                        <td className="product-input"><input type="text"/></td>
+                    </tr>
+                </table>
+        
+                <div className="payment-options">
+                    <div className="option">
+                        Cash betaald
+                        <input type="checkbox"/>
+                    </div>
+                    <div className="option">
+                        Overschrijving
+                        <input type="checkbox"/>
+                        BE50 9731 5197 8018
+                    </div>
+                </div>
+            </div>
+            <div className="footer">
+                {this.eigenExemplaar ? ([
+                    <div className="form-for">Eigen exemplaar</div>,
+                    <div className="contact">Contactpersoon: Peter Aerts 0499 26 54 99</div>
+                ]) : ([
+                    <div className="form-for">Exemplaar voor Groen Lummen</div>
+                ])}
+            </div>
+        </div>
+    }
+}
+
+// Kaarten
+document.body.appendChild(render(<div className="kaarten-print">
+    <div className="kaarten-pair">
+        <PastaBuffetKaart eigenExemplaar={true}/>
+        <PastaBuffetKaart/>
+    </div>
+    <div className="kaarten-pair">
+        <PastaBuffetKaart eigenExemplaar={true}/>
+        <PastaBuffetKaart/>
+    </div>
+</div>));