What is id and class in html

Answer 1

ID and class are both CSS Style selectors. In your CSS, when you format a style you initialize the name of that style. To use ID, initialize your style with # before the name. To use class, initialize your style with . before the name. Use either of them in your html code by calling "id=" or "class=". The both do the same thing. It is upto you to choose what you would want to use.

Answer 2

They're also selectors for javascript

Answer 3

.class
#id

Don't forget they override if they're all on the same tag:

the last class override the previous class
id override class
style override id
and using !important override them all

<style>
body {
background-color: black;
font-family: Monospace;
color: red;
}
#white-text {
color: white;
}
.blue-text {
color: blue !important;
}
.green-text {
color: green;
}
</style>
<h1 class="blue-text green-text" id="white-text" style="color: orange">Hi all!</h1>