Do All Browsers Avoid Downloading Unused CSS Images?

CSS Image Loading Behavior for Unused CSS Images

Whether unused CSS images are downloaded by browsers depends on how the browser implements the CSS specification. Some common browsers and their behavior are as follows:

Chrome, Firefox, Safari, IE8, IE7:

These browsers do not download unused CSS images. Unused CSS images refer to images that are referenced in CSS rules but not used on any elements on the page.

IE6:

The behavior of IE6 is unknown in this regard. If anyone has information about IE6's behavior, please leave a comment below.

In the provided CSS example:

.nothingHasThisClass{background:url(hugefile.png);}

browsers like Chrome, Firefox, Safari, IE8, and IE7 will not download the image hugefile.png since no element on the page has the class nothingHasThisClass. However, it's important to note that IE6's behavior is unknown.

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