Graphic coordinate disclosure

Graphics retain exact mathematical sources even when a display cannot distinguish them. In Web and Notebook, open Text alternative, then Coordinate rounding and uncertainty to inspect every retained coordinate. The table gives the source, displayed SVG decimal, outward bounds, and ascending/reversed interval order. It also explains precision, rounding, collision sets, and explicit clip regions. Labels that overlap remain separate semantic objects and retained text entries.

This view consumes the renderer’s rix.svg.coordinate-lowering@1 metadata; hosts do not calculate a second rounding policy. Exact input and certified enclosure bounds remain distinct from approximate input. The outward expansion applies to exact geometry, not a claim that floating-point inputs have become certified. Clipping is reported as an explicit retained operation; it does not infer that every clipped object disappeared or that ordinary label overlap is equality.

SVG exports retain a plain-text <desc> and escaped, inert <metadata> with the same sources and policy. HTML exports retain the complete text/table view without JavaScript. Canvas plans expose accessibility.coordinateDisclosure, textPlan, and text. Their coordinate disclosure describes the SVG reference lowering; the numericPolicy explicitly states that Canvas uses approximate binary numbers and does not certify an outward pixel enclosure. Interval coordinates are drawn at their midpoint while the original interval and orientation remain available. PNG RenderResult metadata already retains coordinateLowering; raster pixels alone do not preserve the full text alternative.

Keyboard controls use the shared viewport/selection protocol. [ and ] select objects; Alt+arrow keys move between spatial neighbors; arrows pan, + and - zoom, and Home resets. Search and the object selector remain available for dense scenes. Reactive replacements preserve open disclosures, the focused toolbar or semantic identity, and selected-object text. Removed identities are cleared; focus restoration does not interrupt an unrelated editor. Repeated unchanged status messages do not trigger new live-region writes, and pointer movement updates the non-live inspector. Reduced-motion styling is shared by both hosts.

Verification

tests/tools/graphic-coordinate-disclosure.test.js covers large exact ratios, intervals narrower than floating-point display, reversed intervals, rounding collisions, labels, clipping, approximate inputs, and HTML escaping. The shared viewport tests include 256 deterministic pan/zoom/responsive transform cases. The fixture source is tests/fixtures/graphic-coordinate-scenes.js.

Run bun scripts/check-graphic-accessibility-browser.js with an installed Playwright module. If it is supplied externally, set RIX_PLAYWRIGHT_MODULE to its entry module; RIX_CHROME_EXECUTABLE may select an installed Chromium binary. No browser or dependency is downloaded. This check mounts the shared Web and Notebook output contract, exercises keyboard selection, 64× view zoom, reactive focus, reduced motion, and 360px layout at 200% CSS zoom, and saves viewport screenshots and an accessibility-tree snapshot below tmp/.

The browser checks verify DOM/ARIA behavior; they do not substitute for a user study or a manual audit with each operating system’s screen reader.