iggyvolz · May 6, 2020 19:00
diff --git a/gistfile1.txt b/gistfile1.txt
 <!doctype html>
 <head>
    <script>
        class foo extends HTMLInputElement
        {
            constructor() {
                alert("constructed");
                super();
            }
            connectedCallback(){
                alert("connected");
            }
        }
        customElements.define("my-custom-element", foo, {extends: "input"});
    </script>
 </head>
 <body>
    <input type="text" is="my-custom-element">
 </body>
	<!doctype html>
	<head>
	<script>
	class foo extends HTMLInputElement
	{
	constructor() {
	alert("constructed");
	super();
	}
	connectedCallback(){
	alert("connected");
	}
	}
	customElements.define("my-custom-element", foo, {extends: "input"});
	</script>
	</head>
	<body>
	<input type="text" is="my-custom-element">
	</body>