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HTML

CSS

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Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

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JavaScript

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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Behavior

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If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

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If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

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HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <div class="btn">Click!</div>
<h1>
  <span>TEST1 TEST1 TEST1</span>
  <span>TEST2 TEST2 TEST2</span>
  <span>TEST3 TEST3 TEST3</span>
  <span>TEST4 TEST4 TEST4</span>
</h1>
              
            
!

CSS

              
                  span {
    position: relative;
    display: block;
    width: 350px;
  }
  span::after {
    content: '';
    display: block;
    background: red;
    position: absolute;
    /*
    rightにすると幕は右側に向かって開き、
    leftにすると幕は左側に向かって開く
    */
    right: 0;
    top: 0;
    width: 100%;
    height: 100%;
    transition: 1s;
  }
  
  /* このクラスを付けることによりカバーが外れる  */
  .delay::after {
    width: 0%;
  }
  
  
  .btn {
    width: 100px;
    line-height: 50px;
    background: #ddd;
    text-align: center;
  }
              
            
!

JS

              
                $(function() {
  var i = 0;
  $('.btn').click(function() {
    //eachにより複数のspanが順次処理される
    $('span').each(function() {
      //delayによる遅延処理。後のspan要素ほど遅延時間が長くなる。
      //これにより時間差でカバーが外れるようになる
      $(this).delay(500 * i).queue(function() {
        $(this).addClass('delay');
      })
      i++;
    });
  });
});
              
            
!
999px

Console