observer.html
509 Bytes
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<button id="addNewObserver">Add New Observer checkbox</button>
<input id="mainCheckbox" type="checkbox"/>
<div id="observersContainer"></div>
<script>
var controlCheckbox = document.getElementById( "mainCheckbox" ),
addBtn = document.getElementById( "addNewObserver" ),
container = document.getElementById( "observersContainer" );
</script>
</body>
</html>