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Editorial Team
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Asked: 2026-06-13T05:05:12+00:00

In my wordpress installation, in the CSS file for the login screen, the background

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In my wordpress installation, in the CSS file for the login screen, the background image is specified like so:

.login h1 a {
    background-image:url('../images/wordpress-logo.png?ver=20120216');
    ....
}

So there is a query string after the png, but how is it read? In the images folder, the png is simply called wordpress-logo.png. The weird thing is, if I replace it, it is not shown.

Obviously I could just remove the versioning in the CSS file, but I’m curious how that works. So, how does png versioning work and how can I use it? Thanks.

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1 Answer

  1. Editorial Team

    That’s a cache-buster.

    If you change the image, you can change the date in the cache-buster to force the browser to re-download it.

    Web servers ignore query strings on static files.

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