reveal/stagger engine facetThe gate for SPEC-105 (§1–§3): a shared, closed reveal modifier plus an orthogonal stagger modifier on section-level runes, emitting the generic data-* hooks and the per-child index the motion CSS and behaviour read. Pure intent → attributes; no look here.
222041d79c3246361be4ceebbc86reveal accepts none | fade | slide | scale | blur (matches set; default none; unknown = build error). A cross-rune facet like media-position/tint, configured once on section-level runes (hero, feature, bento, cta, card, steps, pricing, testimonial, playlist, …) — not per rune.data-reveal="<value>" on the rune root; data-stagger when set; --rf-reveal-index (0,1,2,…) on each enumerated child (reuse the existing numbered-sequence child enumeration). Stagger is a silent no-op on single-child runes.[style*="--rf-reveal-index"], not > *), so "which children cascade" is decided here in config, never in CSS.reveal modifier (none|fade|slide|scale|blur, default none, unknown = build error) is available on section-level runes as a shared engine facet; it emits data-reveal on the root and --rf-reveal-index on enumerated children.stagger is an orthogonal modifier composing with any character; it emits data-stagger, is a silent no-op on single-child runes, and stamps the per-child index marker that drives the cascade.matches validation, the index marker, and the single-child no-op.packages/transform/src/engine.ts · packages/runes/src/config.ts · named-set discipline SPEC-088.Completed: 2026-06-16
Branch: claude/v024-work431-reveal-facet
packages/runes/src/lib/index.ts): added reveal (closed matches: none|fade|slide|scale|blur) and stagger (Boolean) to universalAttributes, so every block rune accepts them and Markdoc's matches enforces the closed vocabulary as a build error for free. Forwarded both onto the output tag alongside width/elevation. Registered both in UNIVERSAL_ATTRIBUTE_NAMES (attribute-presets.ts).packages/transform/src/engine.ts): in the universal-base-attribute block, read reveal/stagger from the tag and emit data-reveal (no BEM class — styled by attribute, like elevation) + data-stagger. Added a stampStaggerIndex helper + a 7c phase that stamps --rf-reveal-index: 0,1,2,… (document order) on the cascade items when stagger is set, merging onto existing inline style; runs after child recursion so it isn't clobbered. Added reveal/stagger to the consumed-attribute strip list so the raw attrs don't leak to output.packages/transform/src/types.ts): new RuneConfig.staggerItems?: string — the descendant data-field/data-name the engine stamps. "Which children cascade" lives in config, never CSS. Wired it into the multi-child section runes: feature→feature-item, bento→cell, steps→step, pricing→tier (marketing), playlist→track (media).packages/transform/test/reveal-stagger.test.ts (10) — emission, no-BEM-class, raw-attr strip, index stamping by data-field/data-name, nested wrapper order, style merge, and the two silent-no-op paths. packages/runes/test/reveal-attribute.test.ts (4) — Markdoc validation accepts the vocabulary, rejects an unknown reveal (attribute-value-invalid) and a non-boolean stagger (attribute-type-invalid). Updated the reference.test.ts universal-attribute list.reveal/stagger are universal attributes (like width/tint), read once in the engine. The per-rune fact — which children cascade — is the only thing that lives in each rune's config (staggerItems); runes without it make stagger a silent no-op, satisfying the single-child case.data-reveal is emitted only when the author sets it (absent = the none default, no attribute); data-stagger is a presence-only empty attribute. No look/keyframes here — that's WORK-432.