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What is a Style Sheet used for?

To speed up web development

To load scripts in to the browser

To improve web page formatting

As a plug-in for Internet Explorer

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A style sheet (CSS) tells the browser how to present a document - fonts, colors, spacing, layout and responsive rules. So is on the right track: improving page formatting is the main function. External style sheets also bring practical benefits: reuse across pages, consistent theming, browser caching for faster loads, and a smaller, easier-to-read HTML base.

As observed, keeping styles in separate files supports maintainability. A simple workflow is to keep global rules in one shared stylesheet and load small page-specific sheets later to override when needed. Use class-based selectors and CSS variables for themes, minify for production, and rely on caching to improve repeat load times. If styles do not apply, common checks are the link tag and path (for example, <link rel="stylesheet" href="styles.css">), server content-type, browser devtools for computed styles and specificity conflicts, and cache-busting to avoid stale files.

For concise reference and best practices see MDN Web Docs - CSS and W3C - CSS.

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Member Avatar for Member #956681

I think

To improve web page formatting

Let me know all you're opinions If I'm incorrect.

external style sheets serve the same purpose as external javascript files; it supports the removal of presentation from functionality, keeping html separate from your css and javascript.

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