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You can just wrap your circles with a
-tags, like you would do with most of the other elements in a html-document.
<svg viewBox="0 0 300 100">
<a href="https://stackoverflow.com/link1">
<circle cx="50" cy="50" r="25"/>
</a>
<a href="http://stackoverflow.com/link2">
<circle cx="125" cy="50" r="25"/>
</a>
<a href="http://stackoverflow.com/link3">
<circle cx="200" cy="50" r="25"/>
</a>
</svg>
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solved How to add page links to svg circle?