Allow rendering geometries to an arbitrary canvas

examples/render-geometry.html

@@ -0,0 +1,9 @@
+---
+layout: example.html
+title: Render geometries to a canvas
+shortdesc: Example of rendering geometries to an arbitrary canvas.
+docs: >
+  This example shows how to render geometries to an arbitrary canvas.
+tags: "render, geometry, canvas"
+---
+<canvas id="canvas"></canvas>