how to add checkbox in front of dropdown code example

Example: html js make dropdown list checkbox

<body>
  
    <div id="list1" class="dropdown-check-list" tabindex="100">
        <span class="anchor">Select Fruits</span>
        <ul class="items">
            <li><input type="checkbox" />Apple </li>
            <li><input type="checkbox" />Berry </li>
            <li><input type="checkbox" />Mango </li>
            <li><input type="checkbox" />Banana </li>
        </ul>
    </div>

    <script type="text/javascript">
      
        var checkList = document.getElementById('list1');
        checkList.getElementsByClassName('anchor')[0].onclick = function (evt) {
            if (checkList.classList.contains('visible'))
                checkList.classList.remove('visible');
            else
                checkList.classList.add('visible');
        }

        checkList.onblur = function(evt) {
            checkList.classList.remove('visible');
        }
    </script>
</body>

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