javascript - How to use animation with append in jQuery? -

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how use animation while appending new element using jquery? went through couple of answers here same method not work me. used show('show') , fadein('slow') not seem animates new element.

$(document).ready(function() {    $('#add-item').click(add);      function add() {      var newitem = $('#new-item-text');      var span = $('<span>', {        class: 'remove',        click: remove      });      var li = $('<li>', {        class: 'todo-item',        text: newitem.val(),        append: span,        click: completed      });      if (newitem.val()) {        $('ul.todo-list').append(li, $('li.todo-new')).fadein('slow');        newitem.val('');      }    }    });
.todo-list {    list-style: none;    padding: 0px;  }  .todo-item {    border: 2px solid #444;    margin-top: -2px;    padding: 10px;    cursor: pointer;    display: block;    background-color: #ffffff;  }  .todo-new {    display: block;    margin-top: 10px;  }  .todo-new input[type='text'] {    width: 260px;    height: 22px;    border: 2px solid #444;  }  .todo-new {    font-size: 1.5em;    color: black;    text-decoration: none;    background-color: #ffffff;    border: 2px solid #444;    display: block;    width: 24px;    float: right;    text-align: center;  }  .todo-new a:hover {    background-color: #0eb0dd;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>  <ul class='todo-list'>    <li class='todo-item'>4l 2% milk      <span class='remove'></span>    </li>    <li class='todo-item'>butter, unsalted      <span class='remove'></span>    </li>    <li class='todo-new'>      <input id='new-item-text' type='text' />      <a id='add-item' href='#'>+</a>    </li>  </ul>

to animate, should start hiding elements, instance setting:

display: none;

then fadein() animate , set display: block;


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