Module layout 

Layout engine — computes size and position for every element.

Chrome equivalent: blink/renderer/core/layout/ + ng/ (LayoutNG).

Architecture (DOM IS the layout tree)

DOM Tree (Document)              Fragment Tree
───────────────────              ──────────────
Storage<LayoutNodeData>          (final positions)
  .style (taffy::Style)
  .cache (taffy::Cache)     ──layout()──►  Fragment (Arc, immutable)
  .layout_children               TextFragment
  .unrounded_layout              Fragment

  Taffy reads/writes LayoutNodeData
  directly via DocumentLayoutView

No separate LayoutTree. Taffy’s trait implementations (LayoutPartialTree, CacheTree, etc.) are on DocumentLayoutView which wraps &mut Document + &LayoutContext.

Module structure

Module	Purpose
node_data	Per-node layout data (style, cache, layout results)
document_layout	Taffy trait impls on Document, resolve pipeline
fragment	Immutable output flowing up
result	Algorithm output wrapper
algo::shared	ComputedValues → taffy::Style conversion
inline	Text measurement, font system
hit_test	Fragment tree hit testing

Re-exports

pub use context::LayoutContext;

pub use fragment::BoxFragmentData;

pub use fragment::ChildFragment;

pub use fragment::Fragment;

pub use fragment::FragmentKind;

pub use fragment::LineFragmentData;

pub use fragment::OverflowClip;

pub use fragment::PhysicalInsets;

pub use fragment::TextFragmentData;

pub use hit_test::HitTestResult;

pub use inline::FontHeight;

pub use inline::FontMetrics;

pub use inline::TextMeasurer;

pub use inline::TextMetrics;

pub use inline::resolve_line_height;

pub use node_data::LayoutNodeData;

pub use result::IntrinsicSizes;

pub use result::LayoutResult;

Modules

algo

Layout algorithms — shared utilities and compliance tests.

box_model

Shared box model utilities — stacking context detection.

context

Layout context — shared state for a layout pass.

document_layout

Layout integration — Taffy traits implemented against Document.

fragment

Fragment — the immutable output of layout.

hit_test

Hit testing — point → DOM element lookup.

inline

Inline formatting context — handles text and inline-level elements.

node_data

Per-node layout data — stored in Document’s parallel storage.

result

Layout result — the output of a layout algorithm.