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

1. Use stable readable IDs, absolute groups, and positive inch dimensions.
2. Keep normal content inside the safe margin and above the footer rail. Only background layout_design objects may be full bleed.
3. Use native text, shape, line, table, and image objects. Recreate labels and values from any supporting visual as native objects.