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| class HelloWorldComponent extends HTMLElement {
| constructor() {
| super();
| }
|
| connectedCallback() {
| const shadowRoot = this.attachShadow({mode: "open"});
|
| shadowRoot.innerHTML = `
| <style>
| div {
| background-color: coral;
| color: white;
| }
| </style>
| <div>Hello World!</div>
| `;
| }
| }
|
| window.customElements.define("hello-world", HelloWorldComponent);
|
|
