PPTX Slide Specification

Author final coordinates directly in layout_tree. No renderer may decide placement, shrink text, or infer layout after the audit.

Required contract

• The root JSON contains summary and slides.
• Every slide has a stable id, a message-led title, an accessibility reading order, and a complete layout_tree.
• A layout tree declares slide size, root group, id-keyed groups and objects, final inch bboxes, styles, z-indexes, and classifications.
• Every meaningful object has id, kind, role, classification, content, style, bbox, and z_index.
• Production summary contains an explicit layout_policy (safe margin, content bottom, footer top, minimum gap) and accessibility metadata.

Authoring rules