Zachary D. Rowitsch 41cd7442c8 Implement CSS 2.1 Appendix E paint order (block bg → floats → inline) ...

Add phased rendering to the display list builder so that within each
stacking context, block backgrounds/borders paint before floats, which
paint before inline content, per CSS 2.1 Appendix E steps 3-5.

Introduces a RenderPhase enum (BackgroundsOnly, InlineContentOnly, Full)
threaded through render_layout_box_normal and render_non_inline_descendants.
Step 6 positioned-auto descendants are collected and rendered via
render_stacking_context for correct internal Appendix E ordering.

Net +20 WPT tests passing (25 promoted, 5 demoted for pixel regressions).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-04 09:24:50 -05:00

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