What's the difference between an id and a class?

Answer 1

In advanced development ids we can basically use JavaScript.

For repeatable purposes, classes come handy contrary to ids which supposed to be unique.

Below is an example illustrating the expressions above:

this is a box
this is a box

Now you can see in here box and box1 are two (2) different

elements, but we can apply the box and bg-color-red classes to both of them.

The concept is inheritance in an OOP language.

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