Salesforce1 - Changes in Attribute Defaults for Visualforce Pages
|Knowledge Article Number||000213649|
|Description||Beginning in API version 33.0
In standard Visualforce the showHeader, sidebar, and standardStylesheet attributes by default are set to True, which means that the standard Salesforce header and sidebar are displayed, and Salesforce styles are used for the page.
When the same page is displayed within Salesforce1, the header and sidebar are removed automatically, in favor of the mobile-optimized user interface of Salesforce1.
However, in prior releases this behavior only removed the HTML for the header and sidebar.
|Resolution||The overall result is to reduce the size of the resources that are sent to the page, which sometimes improves performance, especially for slow network connections.
This change is versioned. Set your page to API version 33.0 or later to invoke the new behavior.