Visualforce: Enhanced for Lightning Experience

Develop apps to customize your org using Visualforce. Visualforce language and feature improvements make app development easier. Changes in this release are focused on improving integration with Lightning Experience. This feature is available in Lightning Experience, Salesforce Classic, and all versions of the Salesforce1 mobile app.
Available in: Contact Manager, Group, Professional, Enterprise, Performance, Unlimited, and Developer Editions

For more information on features affected by these enhancements, refer to the Visualforce Developer’s Guide.