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Editorial Team
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Asked: 2026-05-18T00:31:43+00:00

Example from Wikipedia css: #content a[href^=https://], .link-https { background:url(images/external-link-ltr-icon.png?2) no-repeat scroll right center transparent;

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Example from Wikipedia css:

#content a[href^="https://"], .link-https {
  background:url("images/external-link-ltr-icon.png?2") no-repeat scroll right center transparent;
  padding:0 13px 0 0;
}
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1 Answer

  1. Editorial Team

    That’s actually not part of CSS itself, but rather, part of the querystring to the image.

    It’s the same as:

    http://foo/images/external.png?bar=baz

    The site will take that querystring parameter and value as part of the request. It could make a decision on which file to serve, based on the value supplied.

    Likely it’s a version number. It helps get around the situations where your browser may have cached the image.

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