diff --git a/src/cytoscape-context-menus.js b/src/cytoscape-context-menus.js
index 353b8fa..73fef0e 100644
--- a/src/cytoscape-context-menus.js
+++ b/src/cytoscape-context-menus.js
@@ -38,11 +38,12 @@ export function contextMenus(opts) {
       // Check for each menuItem, if show is true, show the menuItem
       for (let menuItem of cxtMenu.children) {
           if (menuItem instanceof MenuItem) {
+              const is = typeof target.is === 'function' ? (selector) => target.is(selector) : () => false;
               let shouldDisplay = (target === cy) ?
                   // If user clicked in cy area then show core items
                   menuItem.coreAsWell :
                   // If selector of the item matches then show
-                  target.is(menuItem.selector);
+                  is(menuItem.selector);
               // User clicked on empty area and menuItem is core
               if (shouldDisplay && menuItem.show) {
                 cxtMenu.display();
diff --git a/src/utils.js b/src/utils.js
index c5293cc..86aa4ba 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -19,7 +19,7 @@ export function matches(el, selector) {
 
 export function isElementHidden(elem) {
     return elem.offsetWidth <= 0 && elem.offsetHeight <= 0 ||
-        ((elem.style && elem.style.display) || getComputedStyle(elem)['display']);
+        ((elem.style && elem.style.display === 'none') || getComputedStyle(elem)['display'] === 'none');
 }
 
 export function isElementVisible(elem) {