Javascript CSSStyleDeclaration setProperty Method update existing CSS property

Introduction

Modify an existing CSS property:

Click the button to modify an existing CSS property.

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<!DOCTYPE html>
<html>
<head>
<style>
#ex1 {/*  ww  w.j a  v  a 2 s.co m*/
  color: red;
}
</style>
</head>
<body>
<button onclick="myFunction()">Test</button>

<div id="ex1">Some text.</div>

<script>
function myFunction() {
  var declaration = document.styleSheets[0].cssRules[0].style;
  var setprop = declaration.setProperty("color", "blue");
}
</script>

</body>
</html>



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