add 'background' rule, along with 'background-image'

[akhoury]

looks like the imageRegex only supports background-image, but the process skips over css rules such as:

    background: url("assets/img.png");

[vishwanatharondekar]

Having it skip the background only sounds good idea to me. If you have any background which you dont want to be processed by the sprite creator, you can use this.

[akhoury]

• what if you have a large project using background all over the place? you're expected to change all your rules to get them to work with a plugin?
• Why would you want it to skip?
• if you want it to skip, you should use content filters or some other directives, i.e. /* @skip-sprite */
• I am neutral at the point, wrote my own grunt wrapper

[vishwanatharondekar]

I agree to point that directives are good idea. To answer your question when I will want it to skip sprites.

1. When you are using background repeat it gets complex http://stackoverflow.com/questions/8083869/is-it-possible-to-use-repeating-background-images-in-sprites, and I will want to skip those.
2. When you are using background-size. Complex solutions available. http://stackoverflow.com/questions/2430206/how-can-i-scale-an-image-in-a-css-sprite
3. When you are using gif backgrounds.

In a large project also I will not blindly create a sprite with all the images and will want to control what goes in and out, so I will definitely go over all the rules. And I dont think you will have more than 20 images in your project for which you will want to create sprite. You will want to left out the images from library like jquery ui, etc from this.