References — bi-08 Layout

Primary sources first. In-tree Chromium docs beat any external source, including these modules.

Specifications

CSS Display Level 3 — formatting contexts
CSS Box Sizing Level 3 — min-content, max-content, fit-content; measured in fe-06 (sibling project)
CSS Flexible Box Level 1 — including §4.5, the min-width: auto rule behind "my flex item won't shrink"
CSS Grid Level 2 — grid and subgrid
CSS Positioned Layout Level 3 — containing blocks
CSS Containment Level 3 — container queries and their containment requirement

Source — LayoutNG

third_party/blink/renderer/core/layout/
LayoutNG design document — the rewrite's goals: fragment-based, re-entrant, side-effect-free
block_layout_algorithm.cc — note the ng_ prefix was removed; older write-ups still use it
constraint_space.h — the input to every layout algorithm
physical_fragment.h — the immutable output

Background

Life of a Pixel — layout section
Ian Kilpatrick — LayoutNG — BlinkOn talks explaining why the rewrite was necessary

fe-06 — Layout (sibling project) — measured: 1.4× across six layout modes; absolute positioning slowest
fe-01 — Execution model (sibling project) — forced synchronous layout, 86–98× measured
bi-09 — Paint — what layout hands downstream

When a claim here proves stale, record it in PROGRESS.md section 7.