Add "offset" option

README.md

@@ -70,6 +70,11 @@ const options = {
   // Example: document.querySelector('#element-to-scroll'),
   element: window,
 
+  // Additional offset value that gets added to the desiredOffset.  This is
+  // useful when passing a DOM object as the desiredOffset and wanting to adjust
+  // for an fixed nav or to add some padding.
+  offset: 0,
+
   // should animated scroll be canceled on user scroll/keypress
   // if set to "false" user input will be disabled until animated scroll is complete
   cancelOnUserAction: true,

animated-scroll-to.js

@@ -14,7 +14,8 @@
       element: window,
       horizontal: false,
       onComplete: undefined,
-      passive: true
+      passive: true,
+      offset: 0
     };
 
     var optionsKeys = Object.keys(options);
@@ -46,6 +47,9 @@
       }
     }
 
+    // Add additonal user offset
+    desiredOffset += options.offset
+
     options.isWindow = options.element === window;
 
     var initialScrollPosition = null;

package.json

@@ -21,5 +21,7 @@
   },
   "homepage": "https://github.com/Stanko/animated-scroll-to#readme",
   "devDependencies": {
+    "babel-cli": "^6.26.0",
+    "babel-preset-es2015": "^6.24.1"
   }
 }