text: import { LitElement, html } from 'lit-element';
  
  class MyElement extends LitElement {
    static get properties(){
      return {
        prop1: Number,
        prop2: Number
      };
    }
    constructor(){
      super();
      this.prop1=0;
      this.prop2=1;
    }
    render(){
      return html`
        <p>Attribute binding</p>
        <p>prop1: ${this.prop1}</p>
        <button @click="${() => this.changeMe('prop1')}">change prop1</button>
        <button @click="${() => this.changeMe('prop2')}">change prop2</button>
      `;
    }
  }
  customElements.define('my-element', MyElement);
  