2021-06-02 18:26:05 +02:00
|
|
|
<!DOCTYPE html>
|
|
|
|
|
<html>
|
|
|
|
|
<head>
|
|
|
|
|
<style>
|
|
|
|
|
.democlass {
|
|
|
|
|
color: red;
|
|
|
|
|
}
|
|
|
|
|
</style>
|
|
|
|
|
</head>
|
|
|
|
|
<body>
|
|
|
|
|
|
|
|
|
|
<h1>Hello World</h1>
|
|
|
|
|
|
|
|
|
|
<p>Click the button to add a class attribute with the value of "democlass" to the h1 element.</p>
|
|
|
|
|
|
|
|
|
|
<button onclick="myFunction()">Try it</button>
|
|
|
|
|
|
|
|
|
|
<script>
|
|
|
|
|
function myFunction() {
|
|
|
|
|
document.getElementsByTagName("H1")[0].setAttribute("class", "democlass");
|
2021-11-10 18:05:35 +01:00
|
|
|
window.alert(document.getElementsByTagName("HTML")[0].outerHTML);
|
2021-06-02 18:26:05 +02:00
|
|
|
}
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
