One page of the product checks: what a render of the draft would get wrong.

Each product is resolved in each format as a render resolves it, and read by core/creatives/qa.py: text cut off, too tall or shrunk to its minimum, connected text that came out empty, missing and upscaled pictures, text and logos in a safe zone, and the font and binding warnings. Nothing is drawn and nothing is stored; the editor walks the products (or one product set's) with next_cursor.