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How do small icons appear on wikipedia?

I was looking at the source code of wikipedia and I noticed for small icons like this (look at the small pdf icon)

enter image description here

For icons like this there should an <a href> tag somewhere linking the small pdf icon's image. But I looked at source and I couldn't find anything.

enter image description here

I was just curious how do these small icons appear then?

Solution

  • For icons like this there should an <a href> tag somewhere linking the small pdf icon's image.

    No, there shouldn't. The link goes to the PDF. There is no link you can click on to view the icon by itself.

    I was just curious how do these small icons appear then?

    It's a background image on the link element.