Changing the classes of an element
HTML elements can have classes, and as we have seen, we can select elements by the name of the class. As you may remember, classes are used a lot for giving elements a certain layout using CSS.
With JavaScript, we can change the classes of HTML elements, and this might trigger a certain layout that is associated with that class in CSS. We are going to have a look at adding classes, removing classes, and toggling classes.
Adding classes to elements
This might sound a bit vague, so let's have a look at an example where we are going to add a class to an element, which in this case will add a layout and make the element disappear.
<!DOCTYPE html>
<html>
<body>
<script>
function disappear(){
document.getElementById("shape").classList.add("hide");
}
</script>
<style>
.hide {
display: none;
}
.square {
height...
