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HTML

              
                <div id="columns">
  <div class="column" draggable="true"><header>A</header></div>
  <div class="column" draggable="true"><header>B</header></div>
  <div class="column" draggable="true"><header>C</header></div>
</div>
              
            
!

CSS

              
                /* Prevent the text contents of draggable elements from being selectable. */
[draggable] {
  -moz-user-select: none;
  -khtml-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  /* Required to make elements draggable in old WebKit */
  -khtml-user-drag: element;
  -webkit-user-drag: element;
}
.column {
  height: 150px;
  width: 150px;
  float: left;
  border: 2px solid #666666;
  background-color: #ccc;
  margin-right: 5px;
  -webkit-border-radius: 10px;
  -ms-border-radius: 10px;
  -moz-border-radius: 10px;
  border-radius: 10px;
  -webkit-box-shadow: inset 0 0 3px #000;
  -ms-box-shadow: inset 0 0 3px #000;
  box-shadow: inset 0 0 3px #000;
  text-align: center;
  cursor: move;
}
.column header {
  color: #fff;
  text-shadow: #000 0 1px;
  box-shadow: 5px;
  padding: 5px;
  background: -moz-linear-gradient(left center, rgb(0,0,0), rgb(79,79,79), rgb(21,21,21));
  background: -webkit-gradient(linear, left top, right top,
                               color-stop(0, rgb(0,0,0)),
                               color-stop(0.50, rgb(79,79,79)),
                               color-stop(1, rgb(21,21,21)));
  background: -webkit-linear-gradient(left center, rgb(0,0,0), rgb(79,79,79), rgb(21,21,21));
  background: -ms-linear-gradient(left center, rgb(0,0,0), rgb(79,79,79), rgb(21,21,21));
  border-bottom: 1px solid #ddd;
  -webkit-border-top-left-radius: 10px;
  -moz-border-radius-topleft: 10px;
  -ms-border-radius-topleft: 10px;
  border-top-left-radius: 10px;
  -webkit-border-top-right-radius: 10px;
  -ms-border-top-right-radius: 10px;
  -moz-border-radius-topright: 10px;
  border-top-right-radius: 10px;
}
.column.over {
  border: 2px dashed #000;
}
              
            
!

JS

              
                var dragSrcEl = null;

function handleDragStart(e) {
    // Target (this) element is the source node.
    this.style.opacity = '0.4';

    dragSrcEl = this;

    e.dataTransfer.effectAllowed = 'move';
    e.dataTransfer.setData('text/html', this.innerHTML);
}

function handleDragOver(e) {
    if (e.preventDefault) {
        e.preventDefault(); // Necessary. Allows us to drop.
    }

    e.dataTransfer.dropEffect = 'move';  // See the section on the DataTransfer object.

    return false;
}

function handleDragEnter(e) {
    // this / e.target is the current hover target.
    this.classList.add('over');
}

function handleDragLeave(e) {
    this.classList.remove('over');  // this / e.target is previous target element.
}

function handleDrop(e) {
    // this/e.target is current target element.

    if (e.stopPropagation) {
        e.stopPropagation(); // Stops some browsers from redirecting.
    }

    // Don't do anything if dropping the same column we're dragging.
    if (dragSrcEl != this) {
        // Set the source column's HTML to the HTML of the columnwe dropped on.
        dragSrcEl.innerHTML = this.innerHTML;
        this.innerHTML = e.dataTransfer.getData('text/html');
    }

    return false;
}

function handleDragEnd(e) {
    // this/e.target is the source node.

    [].forEach.call(cols, function (col) {
        col.classList.remove('over');
    });
}

var cols = document.querySelectorAll('#columns .column');
[].forEach.call(cols, function(col) {
    col.addEventListener('dragstart', handleDragStart, false);
    col.addEventListener('dragenter', handleDragEnter, false)
    col.addEventListener('dragover', handleDragOver, false);
    col.addEventListener('dragleave', handleDragLeave, false);
    col.addEventListener('drop', handleDrop, false);
    col.addEventListener('dragend', handleDragEnd, false);
});
              
            
!
999px

Console