Load long handbooks without losing reading order
A 200-section handbook blocks interaction, but a virtual-list prototype removes headings while a screen reader navigates them.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Performance · Progressive loading · Accessibility
Estimated field mix
- Performance engineering40%
- Accessibility40%
- Frontend20%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
The fictional Plainview handbook reader serves versioned HTML documents with headings, tables, footnotes, and annotations. Scope is accessible HTML rendering from a structured model; OCR and arbitrary PDF remediation are excluded.
Setup prerequisites
- Versioned synthetic documents with stable section IDs
- Annotation and document-access API contracts to stub
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Initial work is bounded through explicit section loading or an equally accessible documented strategy.
- Loaded sections stay in logical order and focused content is never removed.
- Section-load failure offers in-place retry without resetting the reading anchor.
Implementation constraints
- Profile a reproducible fixture and state the environment; do not optimize by hiding required accessible content.
Verification to include
- Profile initial load and navigate three loaded sections by keyboard and headings.
- Fail the next request while focus stays in the current section; retry without duplicates, reordered headings, or focus loss.
Deliverables
- Incremental loading and before/after profile with reading-order checks
Rollout and recovery
Enable for large documents; keep a full-document option when incremental reading is unsuitable.
Value of the work
For the engineer: Practice semantic structure, accessible navigation, safe annotations, and stable reading positions.
For the team: Inspect how an engineer makes information usable while protecting document integrity and access boundaries.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.