MyElement = import('@polymer/lit-element').then(lit => {
class MyElement extends lit.LitElement {
static get properties() { return { mood: String }}
_render({mood}) {
return lit.html`<style> .mood { color: green; } </style>
Web Components are <span class="mood">${mood}</span>!`;
}
}
if(!window.customElements.get('my-element')) {
window.customElements.define('my-element', MyElement)
}
return MyElement
})