I know you can update the meta-information for specific pages, and for a template, to add code into the page header (by which I mean the “head” section of the html code - not the section of the body content that contains the “header” for a page). But a particular theme (and/or website) can contain multiple templates and many more pages. Is there any way to add header code that is common to every template, and by extension every page, within a particular theme?
If not… maybe there should be (in which case, let’s change this to an “idea” instead of a “question”).