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+## Install dev server packages
+
+    docker run --rm -w /app -v $PWD:/app -u $(id -u):$(id -u) node bash -c "npm install"
+
+## Start the dev server
+
+    docker run --rm --init -it -w /app -v $PWD:/app -p 8080:8080 node bash -c "node dev-server.js"
+
+Visit `localhost:8080` to view.
+
+## Rough way to save the SVG map generated by JavaScript client-side
+
+    const XMLS = new XMLSerializer();
+    const svg_xmls = XMLS.serializeToString(svg);
+    let bl = new Blob([svg_xmls], {type: "text/html" });
+    let a = document.createElement("a");
+    a.href = URL.createObjectURL(bl);
+    a.download = "map.svg";
+    a.hidden = true;
+    document.body.appendChild(a);
+    a.innerHTML = "something random - nobody will see this, it doesn't matter what you put here";
+    a.click()