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<!DOCTYPE html>
<html>
<head>
<style>
p#demo {
  text-decoration: underline;
}
</style>
</head>
<body>
<p id="demo">
Hello world!
</p>
<p>Click the "Try it" button to change the text-decoration-style of the paragraph.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
  document.getElementById("demo").style.textDecorationStyle = "wavy";
}
</script>
</body>
</html>