Modify a singular aspect of shorthand background attribute

Imagine using the shorthand background property to define multiple properties. For example:

.img
{
    background: url('/Content/images/a.png') no-repeat scroll 100% 3px;  
}

If you need to override just the background-position of the image, should you use the full shorthand notation with the updated position like this:

.img
{
  background: url('/Content/images/a.png') no-repeat scroll 0 3px;  
}

Or is it better to only override the background-position property like this:

.img
{
   background-position: 0 3px;  
}

Are there any issues with either approach? Could there be a slight performance gain by only overriding the position?

cssoverriding

Answer №1

To customize a specific property, simply override it as needed. This technique is commonly utilized in CSS Sprites for efficient styling:

[class*=" icon-"] {
  background: url("../img/glyphicons-halflings.png") no-repeat scroll 14px;
}

.icon-glass {
  background-position: 0 0;
}

.icon-music {
  background-position: -24px 0;
}

.icon-search {
  background-position: -48px 0;
}

The method of defining a comprehensive rule first, followed by specifying it for individual classes with concise rules, offers two key benefits:

  • It reduces code length significantly compared to repeating entire definitions with minor updates, resulting in smaller CSS files.
  • It enhances readability by avoiding confusion about unintentionally overwriting previous rules.

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