Output content before the content of a page or section.
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.