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Changing Image Source on Rollover with jQuery: A Comprehensive Tutorial

This tutorial will walk you through the process of changing an image source on mouse hover (rollover) using jQuery. We'll cover the core concepts, provide detailed explanations, and offer practical code examples. We'll explore different approaches, handling of accessibility, and discuss best practices.

*1. Understanding the Core Concepts*

*jQuery:* A fast, small, and feature-rich JavaScript library that simplifies HTML document traversing, event handling, animation, and Ajax interactions for rapid web development. We'll be using jQuery to make our code more concise and cross-browser compatible.
*Events:* User actions (like mouse hover) or browser events that trigger JavaScript code. The key events we'll be using are `mouseover` (when the mouse enters the element) and `mouseout` (when the mouse leaves the element). jQuery simplifies event handling.
*Image Source (src) Attribute:* The `src` attribute of an `img` tag specifies the URL of the image to display. We'll be manipulating this attribute to switch between different images on hover.
*Data Attributes:* HTML5 `data-*` attributes allow you to store custom data within HTML elements. We'll use these to store the alternate image path. This keeps our HTML clean and prevents us from hardcoding image paths directly in the JavaScript.

*2. Setting up your HTML*

First, create an HTML file (e.g., `index.html`) and include jQuery. You can download jQuery from the official website (jquery.com) or use a CDN (Content Delivery Network). We'll use the CDN option for simplicity:



*Explanation:*

*`script src="...jquery.min.js"/script`:* This line imports the jQuery library from the Google CDN. Make sure this line is before your own JavaScript code.
*`img class="rollover-image" ...`:* This is our image element.
`class="rollover-image"`: A class name we'll use to select this image with jQuer ...

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