IT3240 teaches the three foundational front-end web technologies as a coordinated system: HTML for structure, CSS for presentation, and JavaScript for interactive behavior — each with a distinct role that together produces a functional web page.
HTML and CSS fundamentals
IT3240 covers HTML as the structural markup language defining a page's content and semantic organization, and CSS as the styling language controlling visual presentation — layout, color, typography — separately from content structure. Students learn the principle of separating structure (HTML) from presentation (CSS), which makes websites easier to maintain and restyle.
JavaScript for interactivity
The course introduces JavaScript as the language that adds dynamic behavior to an otherwise static page — responding to user clicks, validating form input, and updating page content without a full page reload. Students practice DOM (Document Object Model) manipulation, the core technique JavaScript uses to read and modify a web page's content dynamically.
Key topics in IT3240
- HTML structure and semantic markup
- CSS styling: selectors, the box model, and layout techniques
- Separating content structure (HTML) from presentation (CSS)
- JavaScript fundamentals: variables, functions, and event handling
- DOM manipulation: reading and modifying page content dynamically
- Form validation and basic client-side interactivity patterns
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Worked example: adding interactivity with the DOM
- Static HTML: A form with an email input field and a submit button
- Without JavaScript: Invalid email formats aren't caught until the form is submitted to the server, creating a slow, poor user experience
- With JavaScript: An event listener checks the email field's format as the user types, using DOM manipulation to display an inline error message immediately if the format is invalid
- Lesson: JavaScript's ability to manipulate the DOM in real time is what transforms a static HTML page into a responsive, interactive experience
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Frequently asked questions
Separating structure (HTML) from presentation (CSS) means a web page's content and organization are defined independently from how that content visually looks, which allows a developer to completely restyle a website's appearance — colors, fonts, layout — by changing only the CSS, without needing to touch or restructure the underlying HTML content at all. IT3240 teaches this separation as a best practice because it makes websites significantly easier to maintain at scale — a large website with hundreds of pages can have its entire visual design updated by modifying a shared CSS file, rather than needing to manually update styling embedded directly within every individual HTML page, and it also allows the same HTML content to be presented differently for different contexts (like a print-friendly version or a mobile-optimized layout) using different CSS rules applied to identical underlying content.
The Document Object Model (DOM) is a structured, tree-like representation of a web page's HTML content that the browser creates and maintains in memory, and DOM manipulation refers to using JavaScript to read, add, remove, or modify elements within that structure after the page has initially loaded. IT3240 teaches DOM manipulation as central to interactive web development because it's the mechanism that allows a page to change dynamically in response to user actions without requiring a full page reload from the server — clicking a button to reveal hidden content, typing in a search box to filter a list in real time, or submitting a form and seeing an immediate inline validation message are all accomplished through JavaScript reading the current state of the DOM, detecting an event (like a click or keystroke), and then modifying the DOM to reflect the appropriate change, which the browser then automatically re-renders on screen.