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HTML CSS Fundamentals

HTML and CSS Fundamentals teaches learners how to structure web pages with HTML5, apply semantic markup, and master modern CSS layout techniques including Flexbox and Grid for responsive design.

Who Should Take This

Beginners and early‑career developers who have little or no experience with front‑end coding will benefit. They aim to build a solid foundation in web fundamentals, create accessible, well‑structured pages, and confidently implement responsive layouts as they transition into junior web‑development roles.

What's Included in AccelaStudy® AI

Adaptive Knowledge Graph
Practice Questions
Lesson Modules
Console Simulator Labs
Exam Tips & Strategy
20 Activity Formats

Course Outline

69 learning goals
1 HTML Document Structure
3 topics

Document Skeleton and Head Elements

  • Identify the required elements of an HTML5 document including DOCTYPE declaration, html, head, and body elements and describe their purpose in document parsing
  • Describe the purpose of head elements including title, meta charset, meta viewport, link, and script and explain how they affect page rendering and SEO
  • Implement a complete HTML5 document with proper DOCTYPE, language attribute, character encoding, viewport meta tag, and external stylesheet and script references

Common Elements and Links

  • Identify block-level elements (div, p, h1-h6, ul, ol, li, table) and inline elements (span, a, strong, em, img) and describe how their display behavior differs
  • Implement hyperlinks using anchor tags with href, target, and rel attributes and describe the difference between absolute, relative, and fragment URLs
  • Implement images using the img element with src, alt, width, height, and loading attributes and explain the importance of alt text for accessibility
  • Implement the iframe element for embedding external content and describe the security implications of sandboxing and cross-origin restrictions

Tables, Lists, and Forms

  • Implement HTML tables with thead, tbody, tfoot, tr, th, and td elements including colspan and rowspan for merged cells
  • Implement ordered lists, unordered lists, and description lists (dl, dt, dd) and nest lists to create multi-level hierarchical structures
  • Implement HTML forms with input types (text, email, password, number, date, checkbox, radio), select, textarea, and button elements with proper label associations
  • Implement form validation using required, minlength, maxlength, pattern, min, max, and step attributes and describe how the browser displays validation feedback
  • Analyze form usability best practices including proper fieldset and legend grouping, autocomplete attributes, and input mode hints for mobile keyboards
2 Semantic HTML
3 topics

Semantic Document Structure

  • Identify semantic HTML5 elements including header, nav, main, article, section, aside, and footer and describe the document outline they create
  • Implement a page layout using semantic elements to replace generic div containers and explain how semantic markup improves accessibility and SEO
  • Analyze a webpage structure and determine the most appropriate semantic elements for each content region based on its purpose and relationship to other content
  • Describe the difference between div and span as generic containers and explain when they are appropriate versus semantic alternatives

Accessibility and ARIA

  • Describe ARIA roles, properties, and states and explain when ARIA attributes are needed beyond native HTML semantics
  • Implement accessible navigation patterns using proper heading hierarchy (h1-h6), skip links, and landmark roles to support screen reader navigation
  • Evaluate a webpage for accessibility issues including missing alt text, improper heading order, insufficient color contrast, and missing form labels and recommend fixes

Media and Specialized Elements

  • Implement figure and figcaption elements for images with captions, time element with datetime attribute, and mark, abbr, and details/summary for enhanced semantics
  • Implement audio and video elements with source, controls, autoplay, loop, and poster attributes and provide fallback content for unsupported browsers
  • Implement data attributes (data-*) on HTML elements for embedding custom metadata and describe how CSS can target elements using attribute selectors on data attributes
3 CSS Selectors and Properties
3 topics

Selectors and Combinators

  • Identify CSS selector types including element, class, ID, universal, attribute, and grouping selectors and describe how each targets HTML elements
  • Implement combinators including descendant (space), child (>), adjacent sibling (+), and general sibling (~) to target elements based on their DOM relationships
  • Implement pseudo-classes (:hover, :focus, :first-child, :last-child, :nth-child, :not) and pseudo-elements (::before, ::after, ::first-line) to style elements based on state and position
  • Analyze CSS specificity rules for inline styles, IDs, classes, and elements and evaluate how specificity conflicts are resolved when multiple rules target the same element
  • Implement attribute selectors including [attr], [attr=value], [attr^=value], [attr$=value], and [attr*=value] to target elements based on their HTML attributes

Colors, Typography, and Variables

  • Implement color values using named colors, hexadecimal, rgb(), rgba(), hsl(), and hsla() and describe the relationship between hue, saturation, and lightness
  • Implement typography properties including font-family with fallback stacks, font-size, font-weight, line-height, letter-spacing, text-align, and text-decoration
  • Implement CSS custom properties (variables) using --name syntax and var() function for reusable design tokens across color, spacing, and typography values
  • Implement background properties including background-color, background-image, background-size (cover, contain), background-position, and background-repeat for visual styling
  • Implement linear and radial gradients using the gradient functions as background-image values to create smooth color transitions without image files

Cascade and Inheritance

  • Describe the CSS cascade algorithm including origin, specificity, and source order and explain how !important and layered origins affect rule resolution
  • Explain CSS inheritance behavior and identify which properties are inherited by default (color, font) versus those that are not (margin, padding, border)
  • Analyze conflicting CSS rules across multiple stylesheets and determine which declaration wins based on cascade origin, specificity score, and source order
  • Implement the initial, inherit, unset, and revert keyword values and explain how each resets properties to different baseline values within the cascade
4 Box Model and Layout
3 topics

Box Model Fundamentals

  • Describe the CSS box model components including content, padding, border, and margin and explain how box-sizing: border-box changes the sizing calculation
  • Implement margin and padding using shorthand notation and individual side properties and explain margin collapsing behavior between adjacent block elements
  • Implement border properties including border-width, border-style, border-color, border-radius for rounded corners, and box-shadow for depth effects
  • Analyze margin collapsing rules including when margins collapse between siblings, between parent and child, and between empty elements and evaluate strategies to prevent unwanted collapsing

Display and Positioning

  • Describe the display property values including block, inline, inline-block, none, and flex and explain how each affects element flow and sizing behavior
  • Implement CSS positioning using static, relative, absolute, fixed, and sticky and explain how the containing block and stacking context determine element placement
  • Analyze the z-index stacking context and evaluate how positioned elements, opacity, and transform properties create new stacking contexts that affect layering
  • Implement the float property for wrapping text around images and describe the clearfix pattern for containing floated children within their parent

Units and Sizing

  • Implement CSS units including px, em, rem, %, vw, vh, vmin, vmax, ch, and describe when each unit type is most appropriate for sizing and spacing
  • Implement width, height, min-width, max-width, min-height, and max-height with overflow properties (visible, hidden, scroll, auto) to control element dimensions and content clipping
  • Compare absolute units (px) with relative units (em, rem, %) and viewport units (vw, vh) and evaluate their impact on scalability and accessibility when users change browser font size
5 Flexbox and Grid
3 topics

Flexbox Layout

  • Describe the flexbox layout model including the concepts of flex container, flex items, main axis, cross axis, and how display: flex establishes a flex formatting context
  • Implement flex container properties including flex-direction, flex-wrap, justify-content, align-items, align-content, and gap to control item distribution and alignment
  • Implement flex item properties including flex-grow, flex-shrink, flex-basis, and the flex shorthand to control how items expand, contract, and establish their initial size
  • Implement common flexbox patterns including centered content, navigation bars, card layouts, and holy grail layouts using flex properties and ordering
  • Implement align-self and order properties on individual flex items to override container-level alignment and reorder items without changing the HTML source order

Grid Layout

  • Describe the CSS Grid layout model including grid container, grid items, grid lines, grid tracks, grid areas, and how display: grid establishes a grid formatting context
  • Implement grid container properties including grid-template-columns, grid-template-rows, grid-template-areas, gap, and the repeat() and minmax() functions for track sizing
  • Implement grid item placement using grid-column, grid-row, grid-area, and named lines to position items precisely within the grid
  • Implement auto-fit and auto-fill with minmax() to create responsive grid layouts that automatically adjust column count based on available space without media queries
  • Implement implicit grid tracks using grid-auto-rows, grid-auto-columns, and grid-auto-flow to control the sizing and direction of automatically placed grid items

Flexbox versus Grid

  • Compare flexbox and grid layout models and evaluate when to use each based on one-dimensional versus two-dimensional layout requirements
  • Analyze complex page layouts and determine the optimal combination of grid for overall page structure and flexbox for component-level alignment
6 Responsive Design
3 topics

Media Queries

  • Describe the mobile-first design philosophy and explain how the viewport meta tag controls layout behavior on mobile devices
  • Implement media queries using @media with min-width and max-width breakpoints to apply different styles for mobile, tablet, and desktop screen sizes
  • Implement media queries for print stylesheets, prefers-color-scheme for dark mode support, and prefers-reduced-motion for accessibility-aware animations
  • Analyze common breakpoint strategies and evaluate the trade-offs between device-specific breakpoints versus content-driven breakpoints for maintainable responsive layouts

Fluid Layouts and Transitions

  • Implement fluid typography using clamp() with viewport-relative values to create text that scales smoothly between minimum and maximum sizes
  • Implement responsive images using the srcset attribute with width descriptors, the sizes attribute, and the picture element with source elements for art direction
  • Implement CSS transitions with transition-property, transition-duration, transition-timing-function, and transition-delay for smooth visual state changes on hover and focus
  • Implement CSS transforms including translate, rotate, scale, and skew to reposition and reshape elements without affecting document flow

Responsive Patterns

  • Implement a complete responsive page layout that adapts from single-column mobile to multi-column desktop using a combination of flexbox, grid, and media queries
  • Analyze a responsive design for common breakpoint issues including content overflow, touch target sizing, and readability at different viewport widths and recommend improvements

Scope

Included Topics

  • HTML5 document structure, semantic elements, forms and validation, tables and lists, accessibility and ARIA, CSS selectors and specificity, cascade and inheritance, box model, display and positioning, CSS units, flexbox layout, grid layout, responsive design with media queries, CSS custom properties, transitions, fluid typography, and responsive images

Not Covered

  • JavaScript and DOM scripting
  • CSS preprocessors (Sass, Less, Stylus)
  • CSS-in-JS solutions
  • CSS frameworks (Bootstrap, Tailwind, Foundation)
  • CSS animations and @keyframes beyond transitions
  • SVG and Canvas graphics
  • Web Components and Shadow DOM
  • CSS Houdini and Paint API

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