CSS Image Sprites

CSS Tutorial


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CSS Advanced


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CSS Responsive

CSS Grid

CSS Image Sprites

An image sprite is defines as a collection of images that put it into a single image.

A web page having many images takes a long time to load and creates many server requests.

Ismage sprites reduces the number of server requests and save bandwidth.

Image Sprites – Simple Example

Lets use single image , instead of using three separate images

HTML
				
					<img decoding="async" id="home" src="home.png" width="1" height="1">
<img decoding="async" id="next" src="next.gif" width="1" height="1">
				
			
CSS
				
					#home {
  width: 46px;
  height: 44px;
  background-image: url('home.png') 0 0;
}

#next {
  width: 43px;
  height: 44px;
  background: url('next.gif') -91px 0;
}
				
			

Output

image sprites

Example explained:

<img id=”home” src=”home.gif”> – Only specifies a small transparent image as the src attribute cannot be empty. The displayed image is specifies using CSS, which will be the background image.

width: 46px; height: 44px; – Specifies the portion of the image that is to be used.

background: url(next.gif) 0 0; – Specifies the background image and its position (left 0px, top 0px)

Image Sprites – Create a Navigation List

Use the sprite image (“next.gif”) to create a navigation list.

Using an HTML list, as it can be a link and also acts as a support to background image:

HTML
				
					<ul id="navlist">
  <li id="home"><a href="default.asp"></a></li>
  <li id="prev"><a href="css_intro.asp"></a></li>
  <li id="next"><a href="css_syntax.asp"></a></li>
</ul>
				
			
CSS
				
					#navlist {
  position: relative;
}

#navlist li {
  margin: 0;
  padding: 0;
  list-style: none;
  position: absolute;
  top: 0;
}

#navlist li, #navlist a {
  height: 44px;
  display: block;
}

#home {
  left: 0px;
  width: 46px;
  background: url('navsprites.gif') 0 0;
}

#prev {
  left: 63px;
  width: 43px;
  background: url('navsprites.gif') -47px 0;
}

#next {
  left: 129px;
  width: 43px;
  background: url('navsprites.gif') -91px 0;
}
				
			

Output

Example explained:

  • #navlist {position:relative;} – position is set to relative to enables absolute positioning within it.
  • #navlist li {margin:0;padding:0;list-style:none;position:absolute;top:0;} – margin and padding are set to 0, list-style is removed, and all list items are absolute positioned.
  • #navlist li, #navlist a {height:44px;display:block;} – the height of all the images are 44px.

Now start to position and style for each specific part:

  • #home {left:0px;width:46px;} – Positioned to the left, and the width of the image is set to 46px.
  • #home {background:url(img_navsprites.gif) 0 0;} – Specifies the background image and its position (left 0px, top 0px).
  • #prev {left:63px;width:43px;} – Positioned 63px to the right (#home width 46px + some extra space between items), and the width is 43px.
  • #prev {background:url(‘img_navsprites.gif’) -47px 0;} – Specifies the background image 47px to the right (#home width 46px + 1px line divider).
  • #next {left:129px;width:43px;}- Positioned 129px to the right (start of #prev is 63px + #prev width 43px + extra space), and the width is 43px.
  • #next {background:url(‘img_navsprites.gif’) -91px 0;} – Specifies the background image 91px to the right (#home width 46px + 1px line divider + #prev width 43px + 1px line divider )

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