FA-8904 / Selection controls / Member archive
Two-thumb range-slider constraints: Dragging the selected range moves it outside the domain · case 04
Dragging the selected range moves it outside the domain.
Case contract
Thumbs clamp to domain and maintain minimum separation; translating preserves span and clamps delta against both domain edges.
Why this case matters
A deterministic model of two-thumb range-slider constraints; this isolates one interface invariant without requiring a browser.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| translate upper | [100, 140] | [60, 100] | Failed |
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