<p>HiDPI browsers probably support the new picture element (in the future <a href="http://caniuse.com/#search=picture">http://caniuse.com/#search=picture</a>). So the (few) img with png in it could be replaced by the following construct:</p>

<pre><code><picture>
   <source src="/assets/osm_logo-xxx.svg">
   <img alt="OpenStreetMap Logo" class="logo" src="/assets/osm_logo-xxx.png"/>
   <p>OpenStreetMap Logo</p>
</picture>
</code></pre>

<p>But the logo seems to be the only img tag on the site.</p>

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