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| class HelloSayerComponent extends HTMLElement {
| static observedAttributes = ["name"];
|
| constructor() {
| super();
|
| this.root = this.attachShadow({mode: "open"});
|
| this.root.innerHTML = `
| <style>
| div {
| background-color: coral;
| color: white;
| }
| </style>
| <div>Hello!</div>
| `;
| }
|
| attributeChangedCallback(name, oldValue, newValue) {
| this.root.querySelector("div").innerHTML = `Hello ${newValue}!`;
| }
| }
|
| window.customElements.define("hello-sayer", HelloSayerComponent);
|
| const names = ["Joe", "Allie"];
| let counter = 0;
|
| setInterval(() => document.querySelector("hello-sayer").setAttribute("name", names[counter++ % 2]), 2000);
|
|
