ho wto get the last child element of a parent element code example

Example 1: apply css on last child in parent div

.parent > *:last-child {
  background-color: red;
}

Example 2: last element id javascript

<div id='print'>

                <p id=1>some data</p>
                <p id=2>some data</p>
                <p id=3>some data</p>
                <p id=4>some data</p>
                <p id=5>some data</p>

          </div>