Epic B: DOM Morphing & Rendering Fidelity

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Epic B — DOM Morphing & Rendering Fidelity · Milestone: 0.6.0b · See claudedocs/dev_plan_production_grade_2026-06-24.md

Foundation for navigation, forms, and optimistic-UI quality.

• B1 Adopt morph swap (idiomorph/morphdom) in component-client.js instead of innerHTML replace — enabler — landed via feat(client): adopt Idiomorph morph swap in component-client.js (B1, #22) #43
• B2 Preserve focus / scroll / in-flight input across patches — landed via feat(client): preserve focus/scroll/in-flight input across morph patches (B2, #22) #44
• B3 Stable list reconciliation key (data-key) — landed via feat(client): stable list reconciliation key for morph (B3, #22) #46
• B4 "Don't morph this" escape hatch for JS-owned regions — landed via feat(client): JS-owned region escape hatch for morph (B4, #22) #45
• B5 (spike) Server-side change tracking feasibility — likely post-1.0, deferred (see closing comment)

Critical path: B1 unblocks Epics C, D, G.

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Epic B is functionally complete for the 0.6.0b — Hardening Foundation milestone. B1-B4 are all merged:

• B1 — Idiomorph morph swap in component-client.js (feat(client): adopt Idiomorph morph swap in component-client.js (B1, #22) #43)
• B2 — Focus/scroll/in-flight input preservation across patches (feat(client): preserve focus/scroll/in-flight input across morph patches (B2, #22) #44)
• B3 — Stable data-key list reconciliation (feat(client): stable list reconciliation key for morph (B3, #22) #46)
• B4 — data-no-morph escape hatch for JS-owned DOM regions (feat(client): JS-owned region escape hatch for morph (B4, #22) #45)

B5 (server-side change tracking feasibility spike) is intentionally left unchecked and out of scope for this closure — the issue's own body already scopes it as "likely post-1.0," and the dev plan (claudedocs/dev_plan_production_grade_2026-06-24.md) treats it as a separate exploratory spike, not a hard dependency for the DOM-morphing rendering-fidelity work this epic covers. Deferring it to a future, explicitly-scoped issue rather than blocking this epic's closure on it.

Closing as complete.