それを自分で試してみてください - JavaScript Reference element_clientheight

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

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

<div id="myDIV">
  <b>Information about this div:</b><br>
  Height: 250px<br>
  Width: 400px<br>
  padding: 10px<br>
  margin: 15px<br>
  border: 5px<br>
  <p id="demo"></p>
</div>

</body>
</html>