Module 8 · 8 chapters

JavaScript DOM & Browser

JavaScript in the browser is all about the DOM — the live tree of HTML elements your code can select, modify, and respond to. Click handlers, form validation, dynamic content updates, and local storage all build on DOM APIs.

This module takes you from querySelector to full user interaction patterns. You will learn event delegation, form handling, and how to persist state in localStorage — the skills every frontend developer uses daily.

Chapters in this module

DOM IntroductionThe DOM is the browser's live tree representation of your HTML — nodes you can select, modify, and attach listeners to. See how documents become objects JavaScript can control.
Selecting ElementsLearn Selecting Elements in JavaScript — covering querySelector, querySelectorAll, By ID, Class, Tag, DOM Traversal with interactive visual examples and step-by-step explanations.
Modifying ElementsLearn Modifying Elements in JavaScript — covering Content, Attributes, Classes & Styles, Creating Elements with interactive visual examples and step-by-step explanations.
EventsLearn Events in JavaScript — covering addEventListener, The Event Object, Common Events, Removing Listeners with interactive visual examples and step-by-step explanations.
Event PropagationLearn Event Propagation in JavaScript — covering Three Phases, Bubbling, Capturing, stopPropagation with interactive visual examples and step-by-step explanations.
Forms & ValidationLearn Forms & Validation in JavaScript — covering Form Basics, Reading Values, FormData API, Validation with interactive visual examples and step-by-step explanations.
Local StorageLearn Local Storage in JavaScript — covering Basics, Storing Objects, Practical Patterns, Limitations with interactive visual examples and step-by-step explanations.
Session StorageLearn Session Storage in JavaScript — covering How It Works, vs localStorage, Use Cases, Tab Isolation with interactive visual examples and step-by-step explanations.

Start with DOM Introduction