how to use data-toggle in bootstrap code example

Example 1: on button click show collapse div jquery

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="button">Toggle Expand/Collapse</button>
<div id="wrapper">
  <ul id="list">
    <li>Item</li>
    <li>Item</li>
    <li>Item</li>
    <li>Item</li>
  </ul>
</div>

Example 2: on button click show collapse div jquery

$(function() {
  var b = $("#button");
  var w = $("#wrapper");
  var l = $("#list");
  b.click(function() {
    w.toggleClass('open'); /* <-- toggle the application of the open class on click */
  });
});

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Html Example