<html>
<body>
<h1 style="color:red">Hello World</h1>
<p id="demo">Click the button below to remove the style attribute from the header above.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
document.getElementsByTagName("H1")[0].removeAttribute("style");
};
</script>
</body>
</html>