diff --git a/.travis.yml b/.travis.yml
index 1fb368be41..475a17ebbd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: node_js
 sudo: false
 dist: trusty
-node_js: stable
+node_js: 8
 addons:
   firefox: latest
   chrome: stable
diff --git a/lib/utils/gestures.html b/lib/utils/gestures.html
index a948ac3a7e..04a7c58b32 100644
--- a/lib/utils/gestures.html
+++ b/lib/utils/gestures.html
@@ -113,6 +113,7 @@
     'select': true
   };
 
+  // Defined at https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#enabling-and-disabling-form-controls:-the-disabled-attribute
   /** @type {!Object<boolean>} */
   const canBeDisabled = {
     'button': true,
@@ -1071,7 +1072,7 @@
       let dy = Math.abs(e.clientY - this.info.y);
       // find original target from `preventer` for TouchEvents, or `e` for MouseEvents
       let t = Gestures._findOriginalTarget(/** @type {Event} */(preventer || e));
-      if (!t || (canBeDisabled[t.localName] && t.disabled)) {
+      if (!t || (canBeDisabled[/** @type {!HTMLElement} */(t).localName] && t.disabled)) {
         return;
       }
       // dx,dy can be NaN if `click` has been simulated and there was no `down` for `start`
diff --git a/test/unit/gestures.html b/test/unit/gestures.html
index a691526bea..f3734356f9 100644
--- a/test/unit/gestures.html
+++ b/test/unit/gestures.html
@@ -692,7 +692,7 @@
           el.tapAll();
           assert.deepEqual(el.taps, ['div']);
           document.body.removeChild(el);
-        })
+        });
       });
     });
   </script>