How to Seamlessly Swap Images on Hover Using CSS or JavaScript?

How to Dynamically Swap Images on Hover Using CSS/HTML

When setting images to dynamically change when the mouse hovers over, it's crucial to address certain nuances to ensure the desired effect is achieved. One common issue arises when the original image persists and overlaps the new one, while the height and width may not adjust accordingly.

Code Snippet:

Consider this example HTML/CSS code:

<img src="LibraryTransparent.png">

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

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

Using background-image in the :hover state is one approach to dynamically change the image. However, an additional solution can be employed using JavaScript:

JavaScript Option:

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

In this scenario, JavaScript is utilized to swap the image source when the mouse hovers over and restore it upon mouse out. This method ensures that the original image disappears and the new one seamlessly replaces it, preventing any overlapping or sizing issues.

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