JAVASCRIPT

jquery append div

$('#box').append(
  $('<div/>')
    .attr("id", "newDiv1")
    .addClass("newDiv purple bloated")
    .append("<span/>")
      .text("hello world")
);

jquery append div

	$('#div_id').append(
      $('<div/>', {'id': 'child_div',  'class': 'className','style':'width: 100%; height: 100%;'})
    );