Template for a complex 3-3-4 column layout.
This template mimics the display of the legacy "Bartik" layout, which includes responsive and collapsible columns.
Variables:
- $title: The page title, for use in the actual HTML content.
- $messages: Status and error messages. Should be displayed prominently.
- $tabs: Tabs linking to any sub-pages beneath the current page (e.g., the view and edit tabs when displaying a node).
- $action_links: Array of actions local to the page, such as 'Add menu' on the menu administration interface.
- $classes: Array of CSS classes to be added to the layout wrapper.
- $attributes: A string of attributes to be added to the layout wrapper.
- $content: An array of content, each item in the array is keyed to one
region of the layout. This layout supports the following sections:
- $content['header']
- $content['top']
- $content['content']
- $content['sidebar_first']
- $content['sidebar_second']
- $content['triptych_first']
- $content['triptych_middle']
- $content['triptych_last']
- $content['footer_firstcolumn']
- $content['footer_secondcolumn']
- $content['footer_thirdcolumn']
- $content['footer_fourthcolumn']
- $content['footer']