Add key bindings for h, j, k, l, w, a, s, d

       enterTrigger.style.display = 'none'
       initChat()
   }
+
+  document.addEventListener('keydown', e => {
+    const keyCode = e.keyCode;
+    const em = parseFloat(getComputedStyle(document.documentElement).fontSize)
+    if (keyCode == 70) {                             // f
+      // TODO follow links
+    } else if (keyCode == 72) {                      // h
+      history.back()
+    } else if (keyCode == 74) {                      // j
+      document.documentElement.scrollTop += 3 * em
+    } else if (keyCode == 75) {                      // k
+      document.documentElement.scrollTop -= 3 * em
+    } else if (keyCode == 76) {                      // l
+      history.forward()
+    } else if (keyCode == 87) {                      // w
+      // move up (in room)
+    } else if (keyCode == 65) {                      // a
+      // move left (in room)
+    } else if (keyCode == 83) {                      // s
+      // move down (in room)
+    } else if (keyCode == 68) {                      // d
+      // move right (in room)
+    }
+  }, false)
 }
 </script>