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https://web.dev/learn/javascript/classes
Classes | web.dev
Learn how to use classes in JavaScript.
classes web dev
https://web.dev/learn/css/pseudo-classes
Pseudo-classes | web.dev
Pseudo-classes let you apply CSS based on state changes. This means that your design can react to user input such as an invalid email address.
classes web devpseudo
https://web.dev/learn/javascript/classes/extends
Extend classes | web.dev
The `extends` keyword lets you create subclasses of existing classes.
classes web devextend