A very simple Leaflet plugin provides pulsing icon.

Requires Leaflet 0.7.0 or newer and modern browser

Check out demo!

npm install @ansur/leaflet-pulse-icon
or clone repo & run npm install
or copy files from releases

Include the CSS and JavaScript files located in \dist directory.

<script src="../L.Icon.Pulse.js" />
<link rel="stylesheet" href="../L.Icon.Pulse.css" />

Create a new L.Icon.Pulse

var pulsingIcon = L.icon.pulse({iconSize:[20,20],color:'red'});
var marker = L.marker([50,15],{icon: pulsingIcon}).addTo(map);

leaflet-pulse-icon is free software, and may be redistributed under the MIT-LICENSE.