DOM & Browser APIs
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The DOM (Document Object Model) is the bridge between JavaScript and HTML — it’s how you create interactive web pages. This module teaches you everything from element selection to building rich browser-based applications.
Module Pages
| Page | What You’ll Learn |
|---|---|
| What is the DOM? | DOM tree structure, how HTML becomes the DOM, document object, console exploration |
| Selecting DOM Elements | getElementById, querySelector, querySelectorAll, getElementsByClassName, NodeLists |
| Manipulating Elements | textContent, innerHTML, creating/removing elements, classList, attributes, styles |
| Events & Event Listeners | addEventListener, event types (click, submit, keydown, scroll), event object, this in events |
| Event Propagation | Bubbling, capturing, stopPropagation, preventDefault, event delegation pattern |
| Forms & Form Events | Submit events, input validation, FormData, real-time validation, controlled forms |
| The Fetch API in Practice | Fetching data from REST APIs, loading states, error handling, rendering dynamic content |
| Browser Storage | localStorage, sessionStorage, cookies, IndexedDB overview, storage limits and security |
| Browser APIs | Geolocation, notifications, clipboard, IntersectionObserver, ResizeObserver, drag-and-drop |
| Chrome DevTools | Elements panel, Console, Network tab, Sources debugger, Performance, Lighthouse audits |
| Project: Interactive To-Do List | Build a full to-do list with add/delete/edit, local storage persistence, and filtering |
Key Takeaways
By the end of this module, you’ll be able to build fully interactive web pages, handle user input through events, fetch and display data from APIs, persist data in the browser, and debug effectively using DevTools.