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CSS for Web Development: A Comprehensive Guide

Learn the fundamentals of CSS in web design and development. Understand the syntax, benefits, and usage of CSS to style structured HTML documents effectively. Explore the importance of separating content from design, achieving standards compliance, and utilizing inline and external style sheets.

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CSS for Web Development: A Comprehensive Guide

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  1. Web Design Using CSS Web Development Michael Russell

  2. What is CSS? • CSS – Cascading Style Sheets • Text based • Provides the means to create styles for structured (X)HTML documents • Can be used to define position, fonts, colours and graphics for page elements • Provides detailed flexibility in conjunction with (X)HTML id and class elements

  3. CSSSyntax • Selector { property:value; property:value; } e.g. H1 { color : red ; font-size : 16; }

  4. Why Use CSS? • Separate content structure from design • Standards – create one design to work across all platforms and browsers • Efficiency – change one file to change an entire site’s design • Team work – provides a single, standard working method • Accessibility. Accessibility. Accessibility.

  5. Inline styles • CSS styles can be defined within the (X)HTML • E.g.: <p style=“color: #ff0000;”>This will be red.</p> • Avoid inline styles as much as possible • Always be able to justify an inline style specification when used • Will always override styles specified in the <head> or external style sheets

  6. <head></head> styles • Styles defined in the head of an (X)HTML document • Usually useful only for testing, debugging, or “hacks” when absolutely required • Makes sense if the “site” has only one page (very rare!) • Are defined on a page by page basis • Will override external file style sheets, but are overridden by inline styles • Should be avoided

  7. External style sheets • Styles defined in a separate text file • File can be linked to from unlimited (X)HTML files in a site • Properly managed, changes to one file redesign an entire site • Can be cached separately to the (X)HTML files, reducing bandwidth usage • Is overridden by <head> and inline styles • Is the preferred method for defining CSS

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