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<!DOCTYPE html>
<html>
<head>
<style>
div::first-letter {
  font-size: xx-large;
}
</style>
</head>
<body>
​
<p>Click the button to get the computed font size for the first letter in the test div.</p>
<p><button onclick="myFunction()">Try it</button></p>
<div id="test" style="height: 50px;background-color: lightblue;">Test Div</div>
<p>The computed font size for div::first-letter in the test div is: <span id="demo"></span></p>
​
<script>
function myFunction(){
  var elem = document.getElementById("test");
  var theCSSprop = window.getComputedStyle(elem, "first-letter").getPropertyValue("font-size");
  document.getElementById("demo").innerHTML = theCSSprop;
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_getcomputedstyle3 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:04:10 GMT -->
</html>
​
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