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Expiration of long caches: do I need to rename the background file img, as well as css?

I have relatively long cache expiration headers and made some changes to my site. I will change the names of the .css and .js files to prevent the loading of old files from the user's cache.

Do I also need to rename the background images (which also changed) that are referenced in css? I think yes, but thought I would check ...

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Yes - To ensure that browsers view new image files in this scenario, you must also change the image file names.

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