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<!DOCTYPE html>
<html>
<head>
<style>
.democlass {
  color: red;
}
</style>
</head>
<body>
​
<h1 class="democlass">Hello World</h1>
​
<p id="demo">Click the button to remove the class attribute from the h1 element.</p>
​
<button onclick="myFunction()">Try it</button>
​
<script>
function myFunction() {
  document.getElementsByTagName("H1")[0].removeAttribute("class"); 
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_element_removeattribute by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:04:08 GMT -->
</html>
​
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