Pseudo classes are keywords added to selectors that specify state of selected elements.
To demonstrate an example would be
: active: checked, first.
The Hover features allows users to interact with elements which when you click on the element it triggers a reaction.
Its important to add a dot before the attribute to specify what you want it to do.
the checked option selects radio checkbox or option element.
Lastly the nth type selects elements of given type, based on their position among group of siblings.
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