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CSS
Cascading Style Sheets
MIME type: text/css
CSS files define the visual presentation of HTML documents — colors, fonts, layouts, animations, and responsive design. CSS is one of the three core technologies of the web alongside HTML and JavaScript.
Advantages
- +Separates content from presentation
- +Responsive design with media queries
- +Animations and transitions
- +Reusable across pages
Limitations
- -Specificity conflicts can be confusing
- -Browser inconsistencies (less common now)
- -No variables in older CSS (use custom properties)
- -Can be hard to maintain at scale
Common Use Cases
Website styling and themingResponsive/mobile layoutsAnimations and transitionsPrint stylesheetsEmail templates
Technical Details
CSS3 is the current standard with modules for flexbox, grid, custom properties (variables), transitions, animations, and more. CSS uses selectors to target HTML elements and apply declarations (property-value pairs). Specificity determines which rules take precedence.
Frequently Asked Questions
What is a CSS file?
A CSS file defines the visual style of a website — colors, fonts, spacing, layouts, and animations. It's linked to HTML files to control how web pages look.