aac108d2_Dojo_Toolkit___Reference_Guide__Action
[Key] With focus on the tab title of the tab to delete, press Delete or ctrl + w. Note that the tab must have been created with deletion enabled via the closable attribute. For 1.1 and later releases, pressing shift-F10 with focus on the tab title or right mouse clicking on the tab title will bring up a context menu with the option to Close the tab. This provides a mechanism to determine if the tab is closable. [Action] 
Delete a tab
dijit/layout/TabContainer — The Dojo Toolkit - Reference Guide
Action