diff --git a/ion/src/simulator/web/preamble_env.js b/ion/src/simulator/web/preamble_env.js
index 42fc03f95..3400727ff 100644
--- a/ion/src/simulator/web/preamble_env.js
+++ b/ion/src/simulator/web/preamble_env.js
@@ -18,4 +18,13 @@ Module["preRun"] = function () {
         ENV[key] = Module['env'][key];
     }
   }
+  /* When figuring up in which DOM element to draw, SDL2/emscripten looks for
+   * an element with an id of "canvas". That's pretty annoying because it pretty
+   * much prevents us from running multiple instances of Epsilon in a single web
+   * page even if Epsilon is built using MODULARIZE=1.
+   * Enters specialHTMLTargets. This is a nifty hack that allows one to override
+   * DOM node lookups made by Emscripten! Using this feature, we can instruct
+   * emscripten to use a custom element when looking for "#canvas".
+   * See https://github.com/emscripten-core/emscripten/pull/10659 */
+  specialHTMLTargets["#canvas"] = Module.canvas;
 }