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Progress indicator representation: A completed zero-span range is announced as unstarted · case 03

A completed zero-span range is announced as unstarted.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Indeterminate indicators omit numeric value and are busy; determinate values clamp, percentages normalize the range, zero-span means complete, and busy reflects explicit state.

Why this case matters

A deterministic model of progress indicator representation; this isolates one interface invariant without requiring a browser.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
empty range	`{"busy": false, "label": "Upload", "percent": 0, "role": "progressbar", "value": 10}`	`{"busy": false, "label": "Upload", "percent": 100, "role": "progressbar", "value": 10}`	Failed

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