HTML & CSS: The Building Blocks of the Web

HTML (HyperText Markup Language)

What it is: HTML is the standard markup language used to create and structure content on the web.

Key characteristics:

Provides the skeleton/structure of a webpage
Uses tags (like <html>, <head>, <body>, <p>, <div>) to define elements
Not a programming language - it's a markup language
Current version is HTML5

Basic HTML document structure:

<!DOCTYPE html>
<html>
<head>
    <title>Page Title</title>
</head>
<body>
    <h1>My First Heading</h1>
    <p>My first paragraph.</p>
</body>
</html>

CSS (Cascading Style Sheets)

What it is: CSS is the language used to style and layout web pages.

Key characteristics:

Controls presentation, formatting, and appearance
Works with HTML to make pages visually appealing
Uses selectors to target HTML elements
Current version is CSS3

Basic CSS example:

body {
    background-color: lightblue;
}

h1 {
    color: white;
    text-align: center;
}

p {
    font-family: verdana;
    font-size: 20px;
}

How They Work Together

HTML defines the content and structure ("This is a heading, this is a paragraph")
CSS defines the presentation ("The heading should be red and centered, paragraphs should use Arial font")

Methods of applying CSS:

Inline (using the style attribute in HTML elements)
Internal (using <style> tags in the HTML <head>)
External (linking to a separate .css file - most recommended method)

Key Concepts

HTML:

Semantic elements (<header>, <footer>, <article>)
Forms and inputs
Links and navigation
Images and multimedia

CSS:

Selectors (element, class, ID)
Box model (margin, border, padding, content)
Positioning (static, relative, absolute, fixed)
Flexbox and Grid layout systems
Responsive design (media queries)

Together, HTML and CSS form the foundation of nearly every website on the internet.

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