The node a page or section is being created for.
Whether the content is for a page.
This template is called by importing stylesheets before any content of a page or section, but after the title. It calls html.content.pre.custom, then applies html.content.pre.mode to $node. If the $page parameter is true, then this template is being called on an output page. Otherwise, it is being called on a section within a page.