How should image dimensions for a background image be properly specified in CSS?

In my CSS file, I have defined styles for mini icons like this:

/* Total counts - mini icons */
span.count-facebook {
background: #fff url(../images/mini-icons/facebook.png) no-repeat 1px center;
}
span.count-plusone {
background: #fff url(../images/mini-icons/plusone.png) no-repeat 1px center;
}
span.count-twitter {
background: #fff url(../images/mini-icons/twitter.png) no-repeat 1px center;
}
span.count-linkedin {
background: #fff url(../images/mini-icons/linkedin.png) no-repeat 1px center;
}
span.count-stumble {
background: #fff url(../images/mini-icons/stumble.png) no-repeat 1px center;
}
span.count-digg {
background: #fff url(../images/mini-icons/digg.png) no-repeat 1px center;
}
span.count-delicious {
background: #fff url(../images/mini-icons/delicious.png) no-repeat 1px center;
}
span.count-pinit {
background: #fff url(../images/mini-icons/pinit.png) no-repeat 1px center;
}
span.count-reddit {
background: #fff url(../images/mini-icons/reddit.png) no-repeat 1px center;
}

The dimensions of these icons, such as facebook.png and plusone.png, are all fixed at 24px x 24px. I question whether simply adding height:24; width:24; to each .png instance in the code will actually affect the images themselves, but I could be mistaken.

I wonder if it is feasible to include a height and width attribute specifically for the background images. Thank you!

css

Answer №1

If you're looking to reduce the size of your code, one way to do it is by following these steps:

span.count-facebook, span.count-plusone{width:24px; height:24px;}

span.count-facebook {background: #fff url(../images/mini-icons/facebook.png) no-repeat 1px center;}
span.count-plusone {background: #fff url(../images/mini-icons/plusone.png) no-repeat 1px center;}

To simplify things, you can just include the width and height properties in all classes - since they are icons, adding a simple comma will do the trick. This saves you from having to constantly add those attributes every time.

Once you have defined the classes for the icons with the specified width and height, you can easily modify them by changing the file names like .png.

Another option would be to make use of an image sprite by setting the image dimensions along with width and height for each, adjusting only the background-position for the previously mentioned redefined classes.

I hope this explanation proves helpful to you.

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