HTML (the Hypertext Markup Language) and CSS (Cascading Style Sheets) are two of the core technologies for building Web pages. HTML provides the structure of the page, CSS the (visual and aural) layout, for a variety of devices. JavaScript is a lightweight, interpreted scripting language widely used to enhance and add content to a web page. CSS is the language for describing the presentation of Web pages, including colors, layout, and fonts. It allows for it to adapt the presentation to different types of devices, such as large screens, small screens, or printers. CSS is independent of HTML and can be used with any XML-based markup language. JavaScript in the browser can interact with HTML elements, which are event emitters, that is, subjects able to emit events. Without JavaScript the button is inanimate
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