💻 Frontend Development (HTML/CSS/JavaScript)

 💻 What is Frontend Development?

Frontend development focuses on building the user-facing part of websites and web applications — everything the user sees and interacts with in their browser.


🔧 Core Technologies

🧱 1. HTML (HyperText Markup Language)

Purpose: Structure and content of web pages


Example:


html

Copy

Edit

<!DOCTYPE html>

<html>

<head>

  <title>My First Website</title>

</head>

<body>

  <h1>Welcome!</h1>

  <p>This is my first webpage.</p>

</body>

</html>

🎨 2. CSS (Cascading Style Sheets)

Purpose: Styling and layout (colors, fonts, positioning)


Example:


html

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<style>

  body {

    background-color: #f0f0f0;

    font-family: Arial;

  }

  h1 {

    color: navy;

  }

</style>

Or external CSS:


css

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Edit

/* style.css */

h1 {

  color: crimson;

}

⚙️ 3. JavaScript (JS)

Purpose: Interactivity (buttons, forms, animations, dynamic content)


Example:


html

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Edit

<button onclick="sayHello()">Click Me</button>


<script>

  function sayHello() {

    alert("Hello, World!");

  }

</script>

🧰 Frontend Developer Toolset

Tool Purpose

VS Code Code editor

Chrome DevTools Debugging & testing

Git + GitHub Version control

NPM/Yarn Managing frontend libraries

Figma UI/UX design collaboration


🚀 Modern Frontend Stack (Beyond Basics)

Frameworks/Libraries: React, Vue, Angular


CSS Frameworks: Bootstrap, Tailwind CSS


Bundlers: Webpack, Vite, Parcel


TypeScript: Typed JavaScript for scalability


APIs: REST, GraphQL for backend communication


📦 Example: Small Frontend Project

html

Copy

Edit

<!DOCTYPE html>

<html>

<head>

  <title>Simple Calculator</title>

  <style>

    body { font-family: sans-serif; text-align: center; margin-top: 50px; }

    input { padding: 5px; margin: 5px; width: 100px; }

  </style>

</head>

<body>

  <h1>Simple Calculator</h1>

  <input id="num1" type="number" placeholder="First number">

  <input id="num2" type="number" placeholder="Second number">

  <button onclick="addNumbers()">Add</button>

  <h2 id="result"></h2>


  <script>

    function addNumbers() {

      const a = parseFloat(document.getElementById('num1').value);

      const b = parseFloat(document.getElementById('num2').value);

      document.getElementById('result').innerText = 'Result: ' + (a + b);

    }

  </script>

</body>

</html>

🛣️ Learning Roadmap

Learn HTML/CSS


Understand JavaScript basics


Responsive design with CSS Flexbox/Grid


DOM manipulation with JavaScript


Use Git/GitHub for projects


Build real projects


Explore a frontend framework (e.g., React)


📚 Resources

MDN Web Docs


freeCodeCamp


Frontend Mentor


JavaScript.info

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