What does the Blueprint do?

The Blueprint designs a page before anyone writes code: which sections it has, in what order, what each one needs to say, and the structured data it should declare.

It also runs the page through the same checks the audit applies to a client site: title outside the length limits, duplicate H1, images without alt text, a required section missing for that page type, a call to action that isn't there.

The result comes out as HTML, ready for whoever builds the page.