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Progress indicator representation: Out-of-range progress exposes invalid accessible values · case 04

Out-of-range progress exposes invalid accessible values.

Member previewVariant 4 · 3 implementations · 10 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
below	`{"busy": true, "label": "Upload", "percent": -75, "role": "progressbar", "value": -5}`	`{"busy": true, "label": "Upload", "percent": 0, "role": "progressbar", "value": 10}`	Failed

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