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<!DOCTYPE html>
<html>
<body>
<h1 style="color: red; font-size:50px;">The cssText Property</h1>
<p>Click the button to return the value of the element's inline style declaration.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var elmnt = document.getElementsByTagName("h1")[0];
  var x = elmnt.style.cssText;
  document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>