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Published: September 7, 2026
A filter mockup shows controls but often hides the product rules. The handoff should explain which filters combine, whether choices affect the URL, and how the page responds when data changes.
Write the state model
For every control, record its data field, allowed values, default, multi-select behavior, and relationship to other controls. Define whether selections use AND or OR logic. Include sorting, pagination, and the order in which result counts update.
Decide what belongs in the URL
Shareable searches need stable, readable parameters and a defined canonical strategy. Specify back-button behavior, preserved scroll position, invalid parameters, and reset actions. Ask the search owner to decide which combinations, if any, should be indexed.
Design beyond populated results
- Loading and delayed response.
- No results with active filters.
- Partial data or a failed service.
- Long labels and translated values.
- Keyboard and screen-reader operation.
- A filter panel opening and closing on narrow screens.
Verify with known fixtures
Create a small test dataset with expected counts. Record query, filters, sort, expected identifiers, and observed result. That evidence exposes logic errors a screenshot cannot.
Further reading
Related Articles
Keep filter acceptance tied to the documented content model and analytics plan.
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Turn the guidance into a reviewable handoff
Record the owner, input, acceptance condition, evidence, and escalation point before production begins. That small contract makes the work easier to inspect and approve.
Plan a website production handoff