Module document_layout 

Layout integration — Taffy traits implemented against Document.

The DOM IS the layout tree. Taffy reads/writes LayoutNodeData directly from Document’s parallel storage. No separate LayoutTree needed.

Architecture

Document                       DocumentLayoutView
────────                       ──────────────────
Storage<LayoutNodeData>  ←──   TraversePartialTree (child iteration)
  .style                 ←──   LayoutPartialTree   (style access)
  .cache                 ←──   CacheTree           (layout caching)
  .unrounded_layout      ←──   set_unrounded_layout
  .layout_children       ←──   child_ids / child_count

Entry point

// In FrameWidget:
doc.resolve_layout(root, Some(vw), Some(vh), &ctx)