3 -Styling Web Pages with CSS — Topics & Learning Outcomes

Module Topics

Introduction to CSS

• What is CSS? — CSS, or Cascading Style Sheets, is a stylesheet language used to control the visual presentation of HTML documents.
• How CSS Works with HTML — CSS works alongside HTML by targeting HTML elements and applying visual rules to them.
• Inline CSS — Inline CSS is applied directly to a single HTML element using the style attribute within the opening tag.
• Internal CSS — Internal CSS is written inside a <style> element placed within the <head> section of an HTML document.
• External CSS — External CSS stores all styles in a separate .css file that is linked to one or more HTML documents.
• Choosing the Right Method — Each of the three CSS methods — inline, internal, and external — has appropriate use cases depending on the scope and scale of styling needed.

CSS Selectors

• Element Selectors — Element selectors target HTML elements directly by their tag name, applying styles to every instance of that element on the page.
• Class Selectors — Class selectors target elements that share a specific class attribute, allowing the same styles to be applied to multiple elements regardless of their tag type.
• ID Selectors — ID selectors target a single, unique element on a page using the element's id attribute, making them ideal for styling one-of-a-kind components.
• Combination Selectors — Combination selectors allow developers to target elements based on their relationship to other elements or by combining multiple conditions, enabling precise styling control.
• CSS Specificity — Specificity is a scoring system browsers use to determine which CSS rule takes precedence when multiple rules target the same element and property.
• The Cascade — The cascade is the algorithm CSS uses to resolve conflicts between rules, considering origin, specificity, and source order to decide which styles are ultimately applied.

The Box Model

• What Is the Box Model? — Every HTML element on a web page is treated by the browser as a rectangular box. This box is made up of four distinct areas that together form the CSS Box Model.
• The Content Area — The content area is the innermost part of the box, where the actual text, images, or other media of an element are displayed.
• Padding — Padding is the space between the content area and the element's border. It creates breathing room inside the element, pushing the content away from the edges.
• Border — The border wraps around the padding and content areas, forming a visible or invisible boundary around the element. It sits between the padding and the margin.
• Margin — Margin is the outermost layer of the box model, creating space outside the element's border to separate it from neighboring elements.
• The box-sizing Property — By default, the 'width' and 'height' properties in CSS apply only to the content area, meaning padding and border are added on top of that size. The 'box-sizing' property changes how the total size of an element is calculated.
• Inspecting the Box Model with DevTools — Modern browser developer tools provide a visual diagram of the box model for any selected element, making it easy to inspect and debug spacing and sizing issues.

Typography and Colors

• Font Family — The font-family property specifies the typeface used to display text on a web page.
• Font Size and Weight — Font size controls how large text appears, while font weight controls its thickness or boldness.
• Line Height and Text Alignment — Line height and text alignment are key properties that directly affect the readability and layout of text blocks.
• Applying Colors with Named Values and Hex Codes — CSS allows colors to be specified using human-readable named values or precise hexadecimal codes.
• Applying Colors with RGB Notation — RGB notation defines colors by specifying the intensity of red, green, and blue channels as numeric values from 0 to 255.
• Styling Text Color and Background Color — CSS provides two distinct properties for applying color: one for text and one for the background of an element.

CSS Layout Techniques

• Understanding CSS Layout Flow — By default, browsers arrange HTML elements using normal document flow, where block elements stack vertically and inline elements sit side by side.
• Introducing Flexbox — Flexbox is a one-dimensional CSS layout model that arranges items in a row or column, making it easy to align and distribute space among elements in a container.
• Aligning and Justifying Flex Items — Flexbox provides two primary axes — the main axis and the cross axis — each controlled by dedicated alignment properties.
• Controlling Individual Flex Items — Properties applied directly to flex children let you override container-level alignment and control how each item grows or shrinks.
• CSS Positioning — The position property removes elements from normal flow or adjusts their placement relative to a reference point, enabling overlapping and fixed UI elements.
• Structuring Multi-Section Page Layouts — Combining Flexbox and positioning allows you to build organized, multi-section page layouts such as headers, sidebars, main content areas, and footers.

Styling a Complete Web Page

• Linking Your Stylesheet to Your HTML Page — Before any CSS can be applied, the external stylesheet must be properly connected to the HTML document using a link element in the head section.
• Organizing Your CSS Stylesheet — A well-organized stylesheet groups related rules together and uses comments to label each section, making the code easier to read and maintain.
• Applying Typography Across the Page — Consistent typography ties a web page together visually by establishing a clear hierarchy of headings, body text, and supporting content.
• Using Color Cohesively — A cohesive color scheme unifies all sections of a web page and reinforces the overall visual identity of the site.
• Styling Layout and Spacing with the Box Model — Proper use of margin, padding, and width controls how each element occupies space on the page and how sections relate to one another visually.
• Styling Navigation and Interactive Elements — Navigation links and buttons are the primary interactive elements on most pages and should receive deliberate styling that signals their purpose to users.
• Reviewing and Refining the Finished Stylesheet — Once all styles are applied, a final review pass ensures the stylesheet is clean, consistent, and free of redundant or conflicting rules.

Student Learning Outcomes

By the end of this module, students will be able to:

Course Outcomes (reference)

No course outcomes have been defined.