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DOM : making a toggling menu

<HTML>
  <head>
  <meta charset="utf-8">
    <style>
/*selecting all the ul in the class menu*/
    .menu ul {
      margin: 0;
      list-style: none;
      padding-left: 20px;
      display: none
    }
    /*name of object element : menu,
    adding something at where : before*/
    .menu .title {
      font-size: 18px;
      cursor: pointer;
    }

    .menu .title::before {
      content: '▶ ';
      font-size: 80%;
      color: green;
      }

      /*here open is an attribute of menu, should be connected without a space, dot operator*/
          .menu.open .title::before {
            /*it can have open because the menu is span ele*/
            content: '▼ ';
          }

          .menu.open ul {
            display: block;
          }



    </style>
  </head>

<body>
  <div id = "sweeties" class="menu">
    <span class="title">Sweeties (click me!)</span>
      <ul>
        <li>Cake</li>
        <li>Donut</li>>
        <li>Honey</li>
      </ul>
  </div>


  <script>
  let menu = document.getElementById('sweeties');
  let title = menu.querySelector('.title');
  //selecting an element which are included in class "title"
  //just as if i am writing an css selector
  //cuz thats how querySelector coordinates
  title.onclick = function(){
    menu.classList.toggle('open');
    //toggle : one argument : if class exists(opened), remove it, return false (close)
        //if not,(chosed) add it and return true (opened)

    //classlist is a read only property that returns a live DOMTokenList
    //collection of the class attributes of the element
  };

  /*OPEM*/
  </script>

  </body>
</HTML>

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JS 5.5 task6 Create an extendable calculator

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