Ironpress now achieves 100% verified visual parity with Chromium across a 1,662-fixture adversarial corpus (1,642 PASS / 0 FAIL / 20 reference-disputed). Every fixture comparison uses the same pinned pdftoppm invocation at 300 DPI — no translation, registration, jitter, or raster replacement.

• Same-rasterizer parity gate: scripts/parity.sh renders every fixture in-process, rasterizes candidate and oracle PDFs symmetrically, and reports pass/fail with complete RGBA evidence.
• refs.lock authenticates each fixture, oracle PDF, renderer, fonts, and provenance.
• baseline.json tracks regression health separately from test history.
• HTML parity report with full visual diffs for every fixture.
• CI gate (.github/workflows/parity.yml) runs the same browser-free check.

• Paged media: @page backgrounds cascade through named, :first, :left, :right, and :blank selectors; sheet decoration modeled semantically.
• Multicol: block flow constraints, nested clip paths, rule positioning, and layout split by semantic responsibility.
• Grid: block-size constrained before track alignment; multicol reference geometry corrected.
• Borders: collapsed table borders resolved as a shared grid; opaque square painting unified; rounded background coverage aligned; vector serialization matches Chromium; bevel geometry matched.
• Filters: inherited filter layer paint space; premultiplied source rendering; raster placement and sampling; linear-light surface parity; descendant clipping to overflow bounds.
• Inline layout: mixed advances unified; atomic inline origins preserved; generated content traversal unified; layout probes replaced with capabilities.
• Text: origin-aware text decorations; text combine expansion handling.
• Tables: cell paint phase ordering; expanded table height honored in flex alignment.
• Images: source pixels preserved for object-fit: cover; source images reused across page fragments; fragmented JPEG background ownership; certificate image rendering optimized.
• Backgrounds: nested fills routed through box background geometry; rounded raster phase fixed; full-box radial masks rendered as native shadings.
• Graphical effects: continued across page boxes; transformed descendants composited in filter sources.
• Transforms: Fontations transform oracle restored; fractional transform parity; CSS print scale reconstructed exactly.
• Raster: bounds quantized from exact DPI; x-height quantization matched with Fontations.
• List markers: built-in markers rendered as vector shapes.
• Opacity: applied to absolute-positioned elements.

• RasterQuality struct: controls background, filter, and image DPI in one policy. CLI exposes --image-dpi, --filter-dpi, --background-raster-dpi.

• 3,500+ unit tests (up from 2,200+)
• 1,662-fixture parity corpus with same-rasterizer verification

Full changelog: https://github.com/gastongouron/ironpress/blob/main/CHANGELOG.md

• Module split: engine.rs (16,500 lines) → 12 focused modules (block, flex, grid, table, text, images, helpers, paginate, inline, context)
• LayoutContext: single struct replacing scattered width/height/containing-block parameters
• LayoutEnv: bundles rules, fonts, counter_state (-3 params per function)

• CSS descendant selectors in text runs (pre code, div span) now match correctly
• margin-left/margin-right on block elements properly reduces width and offsets
• Borders in flex containers — 4 rendering paths fixed (nested TextBlocks, TableRows, Container children, merged flex cells)
• float: right now positions elements at the right edge (Container + TextBlock)
• Percentage width resolves against layout parent, not style-time parent (fixes skill bars, progress indicators)
• Inline text spacing — single BT/ET block per line eliminates cumulative positioning errors
• Times-Roman font metrics — proper AFM widths replace Helvetica approximation
• vw/vh units resolve against actual page size, not hardcoded A4
• SVG clip-path now works on shape elements (rect, circle, path), not just groups
• List indentation uses padding-left matching Chrome UA (user CSS padding-left: 0 works)

• Box-shadow blur — multi-layer concentric approximation replacing solid rectangles
• Python binding — pip install ironpress (PyO3 + maturin)
• Ruby binding — gem install ironpress (Magnus)

• 2,170+ tests (up from 2,081)
• 93% line coverage

• Correct CSS→PDF Y-axis flip for rotate, translate, and composed matrix transforms
• Support scaleX(), scaleY(), translateX(), translateY(), skew(), skewX(), skewY()
• Chained transforms composed into single affine matrix

• viewBox placement fixed in flex cell nested elements (fixes invoice logo)
• Quadratic bezier (Q/T) path commands converted to proper cubic curves
• radialGradient support with objectBoundingBox and userSpaceOnUse
• text-anchor attribute (start, middle, end)

• Inline-block shrink-to-fit width (fixes pill shapes taking full width)
• Flex-grow second pass relayout for percentage-width children (progress bars)
• Separate flex-basis from child layout width (fixes flex-wrap with flex: 1)

• Grid rows wrapped in Container for border + padding around all rows
• Cell backgrounds and borders offset by container padding

• border-radius: 50% percentage resolution (circles)
• Rounded rect background + border stroke for FlexCell elements

• Absolute ::before/::after positioned from container top (not mutated cursor)
• Skip inline text collection to prevent double-rendering

• Container height constrained for overflow: hidden
• Unicode character width estimates for CJK, emoji, Hebrew, Arabic, Greek
• dir="rtl" attribute support

• Compare ALL pages per fixture, not just page 1
• Visual diff images (red = different, white = identical)
• Fixed ImageMagick compare exit code handling

• workflow_dispatch trigger for manual deploys
• apt package caching, lighter font packages