fix(core): guard ProgressBar value label against zero max#3742
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cixzhang merged 1 commit intoJul 10, 2026
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When max was 0 (or negative), the default value-label formatter produced NaN% (0/0) or Infinity%, rendered visually and written into aria-valuetext so screen readers announced "NaN percent". Guard it like the fill percentage already is (max > 0 ? ... : 0).
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Thanks this seems like a reasonable defense
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When
ProgressBaris givenmax={0}withhasValueLabel, the default value-label formatter divides by zero and producesNaN%(from0/0) orInfinity%(fromn/0). That string is rendered visually and written intoaria-valuetext, so screen readers announce "NaN percent".The fill percentage already guards this one line up (
const percentage = max > 0 ? (clampedValue / max) * 100 : 0), so the label just needs the same guard.max={0}is a supported case — there's an existing "handles zero max gracefully" test, but it doesn't sethasValueLabel, so it missed this. Extended it to cover the label andaria-valuetext.