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<!DOCTYPE html>
<html>
<body>
<p>Click the button to create some BR elements.</p>
<button onclick="myFunction()">Try it</button>
<p>When you click the button, a br element is inserted before each span element in div, causing an appropriate line break in the text below.</p>
<div id="myDIV">
  <span>Hello,</span>
  <span>My name is Bob.</span>
  <span>I live in Bobville.</span>
  <span>I am 45 years old.</span>
</div>
<script>
function myFunction() {
  // Get the div element with id="myDIV"
  var div = document.getElementById("myDIV"); 
  // Get all span elements inside of div
  var spans = div.getElementsByTagName("SPAN");  
  // Create a loop which will insert a br element before each span element in div, starting from the second span element
  var i;
  for (i = 1; i < spans.length; i++) {
    var newElem = document.createElement("BR");
    div.insertBefore(newElem, spans[i]);
  }
}
</script>
</body>
</html>