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Image sprites are a technique used in web development to combine multiple images into a single image file. This approach can help reduce the number of server requests and improve website performance.
Image sprites are commonly used for icons, buttons, and other small graphics on a website. CSS is then used to display specific parts of the sprite image as needed.
Here”s a step-by-step guide on how to create and use image sprites in CSS:
Step 1: Create The Sprite Image
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Create a single image file that contains all the individual images (icons, buttons, etc.) you want to use on your website. You can use software like Photoshop or a similar tool to arrange these images into a single image file.
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Save the sprite image in a suitable format like PNG or JPEG. Make sure the individual images within the sprite are well-organized with consistent spacing between them.
Step 2: Add HTML Markup
In your HTML document, you”ll need to add elements that will display the individual images from the sprite. Typically, you”ll use HTML elements like <div> or <span> for this purpose. Here”s an example:
<html> <head> <!-- CSS styling here --> </head> <body> <div class="sprite-icon"></div> </body> </html>
Step 3: Define CSS Classes
In your CSS file / style tag (inline styling), define classes for each element that uses the sprite image. You”ll set the background-image to your sprite image and specify the background-position to display the desired part of the sprite. Here”s an example:
.sprite-icon { width: 32px; /* Set the width of the displayed image */ height: 32px; /* Set the height of the displayed image */ background-image: url(''sprites.png''); /* Path to your sprite image */ background-position: -16px -16px; /* Position of the individual image within the sprite */ }
In the above example, the background-position property is used to specify which part of the sprite image to display. The values (-16px, -16px) represent the position of the desired image within the sprite. By adjusting these values, you can display different images from the sprite.
Step 4: Use The Sprites In HTML
You can now use the CSS classes you defined in your HTML elements to display the individual images from the sprite:
<div class="sprite-icon"></div>
Repeat this process for each element that needs to display an image from the sprite.
CSS Image Sprites – Basic Example
The following example demonstrates how to use CSS image sprites to display multiple images from a single image file.
<html> <head> <style> .orignal-img { width: 300px; height: 100px; } ul { list-style: none; padding: 0; } li { height: 150px; display: block; } li a { display: block; height: 100%; } .bootstrap, .html, .css { width: 150px; height: 150px; background-image: url(''images/devices.png''); background-repeat: no-repeat; } .bootstrap { background-position: -5px -5px; } .html { background-position: -155px -5px; } .css { background-position: -277px -5px; } </style> </head> <body> <h3>Orignal Image</h3> <img class="orignal-img" src="images/devices.png"/> <h3>After implementing CSS image sprites</h3> <ul class="navbar"> <li><a href="#" class="bootstrap"></a></li> <li><a href="#" class="html"></a></li> <li><a href="#" class="css"></a></li> </ul> </body> </html>
CSS Image Sprites – Hover Effect
The following example demostartes how to use image sprites to create a hover effect where the images become slightly transparent when you hover over them −
<html> <head> <style> .orignal-img { width: 300px; height: 100px; } ul { list-style: none; padding: 0; } li { height: 150px; display: block; } li a { display: block; height: 100%; } .bootstrap, .html, .css { width: 150px; height: 150px; background-image: url(''images/devices.png''); background-repeat: no-repeat; } .bootstrap { background-position: -5px -5px; } .html { background-position: -155px -5px; } .css { background-position: -277px -5px; } .bootstrap:hover, .html:hover, .css:hover { opacity: 0.7; } </style> </head> <body> <h3>Orignal Image</h3> <img class="orignal-img" src="images/devices.png"/> <h3>After implementing CSS image sprites</h3> <ul class="navbar"> <li><a href="#" class="bootstrap"></a></li> <li><a href="#" class="html"></a></li> <li><a href="#" class="css"></a></li> </ul> </body> </html>
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