References — bi-09-paint

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

• CSS 2 Appendix E (painting order), CSS Positioned Layout, CSS Transforms, CSS Filter Effects, CSS Compositing and Blending.
• third_party/blink/renderer/core/paint/README.md — primary.
• Life of a Pixel.

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