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<!DOCTYPE html>
<html>
<body>
<h1 style="color: red; font-size: 50px;">Loop Through All Style Properties</h1>
<p>Click the button to display all the style properties of the H1 element:</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var elmnt, i, txt = "";
  elmnt = document.getElementsByTagName("h1")[0];
  for (i = 0; i < elmnt.style.length; i++) {
    txt += elmnt.style.item(i) + "<br>";
  }
  document.getElementById("demo").innerHTML += txt;
}
</script>
</body>
</html>