Untitled-1

<script>
    // Creates MyElements extending HTML Element
    class MyElement extends HTMLElement {
        // Fires when an instance of the element is created or updated
        constructor() {
            super();
        }

        // Fires when an instance was inserted into the document
        connectedCallback() {
        }

        // Fires when an instance was removed from the document
        disconnectedCallback() {
        }

        // Fires when an attribute was added, removed, or updated
        attributeChangedCallback(attrName, oldVal, newVal) {
        }

        // Fires when an element is moved to a new document
        adoptedCallback() {
        }
    }

    // Registers custom element
    window.customElements.define('my-element', MyElement);
</script>