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CSS

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JavaScript

Babel includes JSX processing.

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HTML

              
                <div id="main">
  <div>SCROLL TAG is: <em id="scrollTag"></em> ?
    <pre id="ua"></pre>
  </div>
  <button class="js-scroll" data-tag="html">scroll HTML</button> | 
  <button class="js-scroll" data-tag="body">scroll body</button>
</div>
<footer>
  <a id="bottom" href="#">^ scroll top</a>
  &lt;- <span> used <code>$('html, body')</code> callback run 2 times!<span><br><small>update: 2017-09-21</small>
</footer>
              
            
!

CSS

              
                #main
  height: 1200px
  text-align: center
footer
  text-align: center
pre
  display: block
  margin: 0 auto
  padding: 1em
  background-color: #F7F7F7
  max-width: 50%
  white-space: pre-wrap
  word-wrap: break-word
              
            
!

JS

              
                !function($, w, d) {
  
  function checkScrollTag() {
    var ua = navigator.userAgent;
    console.log( ua );
    
    var scrollTag = ( (!window.chrome && 'WebkitAppearance' in document.documentElement.style) || (ua.indexOf('OPR') !== -1 || ua.indexOf('Edge') !== -1) )? 'body' : 'html';
    
    $('#scrollTag').html(scrollTag);
    $('#ua').text(ua);
  }
  
  $(function() {
    var bottom = $('#bottom').offset().top;
    $(d)
    .on('click', '.js-scroll', function(e) {
      var tag = $(this).data('tag');
      $(tag).animate({
        scrollTop: bottom + 'px'
      }, 300);
      return false;
    })
    .on('click', '#bottom', function(e) {
      // if use $('body, html') Callback is executed twice 
      $('body, html').animate({
        scrollTop: 0
      }, 300, function(e) {
        alert('callback');
      });
    });
    
    checkScrollTag();
  });
}(jQuery, window, document);
              
            
!
999px

Console