Трудяга,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
</head>
<body>
<script>
class Component {
constructor(tagName = "div") {
this.tagName = tagName;
this.node = document.createElement(tagName);
}
}
class newDiv extends Component {
constructor(newVal){
super();
this.node.textContent = newVal;
document.body.appendChild(this.node)
}
}
new newDiv("текст List")
</script>
</body>
</html>