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web/vectorgons-boot.js

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+// Emscripten Module config, in an external file so it loads under a strict CSP
+// (script-src 'self') without needing 'unsafe-inline'. Must load BEFORE
+// vectorgons.js. The canvas (id="canvas") must already exist in the DOM.
+var Module = {
+  canvas: (function () {
+    var c = document.getElementById('canvas');
+    c.addEventListener('click', function () { c.focus(); });
+    // Don't let arrow keys / space scroll the page while playing.
+    c.addEventListener('keydown', function (e) {
+      if ([32, 37, 38, 39, 40].indexOf(e.keyCode) >= 0) e.preventDefault();
+    });
+    return c;
+  })(),
+  print:    function (t) { console.log(t); },
+  printErr: function (t) { console.error(t); }
+};