 want to apply some transition when elements are removed, then a different exit function can be provided that changed the way that elements are removed. </div><div class="qm-html-paragraph">The enter function supplied has a this context which is a Selection which has the element that is to be removed selected. This is why this.remove() is called as the default behaviour. The first argument is the data that the element used to represent. Remember that this element is no longer &#39;linked&#39; to any data in