Tryit Editor v3.6

<!DOCTYPE html>
<html>
<head>
<style>
#myDIV {
  height: 250px;
  width: 400px;
  padding: 10px;
  margin: 15px;
  border: 5px solid red;
  background-color: lightblue;
  overflow: auto;
}

#myDIV2 {
  height: 250px;
  width: 400px;
  padding: 10px;
  margin: 15px;
  border: 5px solid red;
  background-color: lightblue;
}

#content {
  height: 800px;
  width: 2000px;
  background-color: lightyellow;
}
</style>
</head>
<body>

<p>In this example, the child element (#content) inside the first div is bigger than div's height and width 
(the child is 800x2500 while its parent is 250x400), so we have added a scrollbar.</p>

<p>Click the button to get the clientHeight, offsetHeight, clientWidth and offsetWidth of div.</p>

<p>Notice how the scrollbar in the first div "steals" some of div's right and bottom padding, which results in a lower return value for clientHeight and clientWidth in that div, compared to the other one. The offsetHeight and offsetWidth is not affected by this.</p>

var elmnt2 = document.getElementById("myDIV2");
  var txt2 = "";
  txt2 += "<b>Information about div2:</b><br>";
  txt2 += "Height including padding: " + elmnt2.clientHeight + "px<br>";
  txt2 += "Height including padding and border: " + elmnt2.offsetHeight + "px<br>";
  txt2 += "Width including padding: " + elmnt2.clientWidth + "px<br>";
  txt2 += "Width including padding and border: " + elmnt2.offsetWidth + "px";
  document.getElementById("content2").innerHTML = txt2;
}
</script>

</body>

</html>

​x
 
<!DOCTYPE html><html><head><style>#myDIV {  height: 250px;  width: 400px;  padding: 10px;  margin: 15px;  border: 5px solid red;  background-color: lightblue;  overflow: auto;}​#myDIV2 {  height: 250px;  width: 400px;  padding: 10px;  margin: 15px;  border: 5px solid red;  background-color: lightblue;}​#content {  height: 800px;  width: 2000px;  background-color: lightyellow;}</style></head><body>​<p>In this example, the child element (#content) inside the first div is bigger than div's height and width (the child is 800x2500 while its parent is 250x400), so we have added a scrollbar.</p>​<p>Click the button to get the clientHeight, offsetHeight, clientWidth and offsetWidth of div.</p>​<button onclick="myFunction()">Try it</button>​<p>Notice how the scrollbar in the first div "steals" some of div's right and bottom padding, which results in a lower return value for clientHeight and clientWidth in that div, compared to the other one. The offsetHeight and offsetWidth is not affected by this.</p>​<div id="myDIV">  <div id="content"></div></div>​

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