Why is it called 'Cascading' Style Sheets?

The 'Cascade' refers to the algorithm the browser uses to decide which rule applies when there's a conflict. Rules flow downwards. If you write `h1 { color: red; }` and then `h1 { color: blue; }` later in the file, the 'blue' rule cascades over the red one and wins.

Why should I use an external stylesheet instead of putting CSS in the HTML?

External stylesheets follow the 'Separation of Concerns' principle. They allow you to style hundreds of HTML pages from one single file, and browsers cache the `.css` file so returning visitors experience much faster load times.

What is 'Specificity' in CSS?

Specificity is a scoring system used by the browser to determine which CSS rule is most relevant to an element. An ID (e.g., `#logo`) is highly specific and will always override a Class (e.g., `.nav-link`), which in turn overrides a basic HTML tag (e.g., `a`).

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CSS Introduction | CSS3 Tutorial

Learn about CSS Introduction in this comprehensive CSS3 web design tutorial. Master the visual engine of the web. Learn the fundamental syntax of rules, discover the three methods of inclusion, and grasp the core logic of the Cascade and Specificity.

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Visual Architecture Base

Visual Syntax Systems. Initialize your understanding of CSS by mastering the core syntax rules that separate presentation from document structure.

CSS (Cascading Style Sheets) is the language we use to style the visual presentation of web pages. It separates design from structure, making websites beautiful and maintainable.

1The Architecture of Style

A CSS rule is a declaration of intent.

→The Selector: Tells the browser WHICH element to look for (e.g., h1, .button, #logo).
→The Declaration Block: Wrapped in curly braces { }, this contains one or more property/value pairs.
→Properties: Predefined keywords like color, margin, or font-size.
→Values: The settings you apply, like 32px or #FF0099. Every declaration MUST end with a semicolon (;).

2Cascade Control

Why the name 'Cascading'? Because rules flow from top to bottom.

→External Link: The gold standard. Keeps styles in a separate .css file for site-wide consistency.
→Internal Style: Placed in the <style> tag within the HTML <head>. Good for single-page overrides.
→Specificity: This is the 'weight' of a selector. An ID is worth more than a Class, which is worth more than a Tag. If specificity is equal, the last rule written in the code is the one the browser applies.