<p><a href="https://github.com/pnorman" class="user-mention">@pnorman</a> This could be done with javascript and is already! See the 'map layers' panel and look into the code. Tiles for this panel are generated via <a href="">thunderforest.com</a>. Only thing, we have to do is cropping this tile to fit with the map area, viewed by user and then placing this in html's og:image.</p>

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