How to Properly Change an Image on Hover with CSS or JavaScript?

Changing Appearance of Image on Hover using CSS/HTML

You may encounter an issue where you've set an image to display a different image when the mouse hovers over, but the original image is still visible and the new image overlaps or does not change size. For beginners in HTML/CSS, this seemingly simple task can present a challenge.

To fix this issue, ensure that the original image is properly set to be transparent using a transparent image file. Additionally, check that your CSS rules are targeting the correct element using the appropriate selector syntax:

img#Library {
    height: 70px;
    width: 120px;
}

img#Library:hover {
    background-image: url('LibraryHoverTrans.png');
    height: 70px;
    width: 120px;
}

However, if using CSS doesn't resolve the issue, you can consider an alternative method using JavaScript:

<img src='LibraryTransparent.png' onmouseover="this.src='LibraryHoverTrans.png';" onmouseout="this.src='LibraryTransparent.png';" />

In this JavaScript code, the onmouseover and onmouseout events are used to dynamically change the image source based on mouse interaction.

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