class NameFieldComponent extends HTMLElement {
    constructor() {
        super();

        this.root = this.attachShadow({mode: "open"});

        this.root.innerHTML = `
            <style>
                span {
                    background-color: coral;
                    color: white;
                }
            </style>
            <span>
                first name: <slot name="first"></slot> |
                last name: <slot name="last"></slot>
            </span>
        `;
    }
}

window.customElements.define("name-field", NameFieldComponent);