Add context menu

clipboard.js

@@ -6,11 +6,18 @@ export const clipboard = function(superClass) {
   };
 };
 
-export const copyToClipboard = (content) => {
+export const copyToClipboard = async (content) => {
   const txtEl = document.createElement('input');
   txtEl.type = 'hidden';
   document.body.appendChild(txtEl);
   txtEl.value = content;
-  navigator.clipboard.writeText(content);
-  document.body.removeChild(txtEl);
+  
+  try {
+    await navigator.clipboard.writeText(content);
+    return true;
+  } catch (err) {
+    return false;
+  } finally {
+    document.body.removeChild(txtEl);
+  }
 }