Accessibility

Reduced motion, contrast for dithered text, and the semantics of each component.

Reduced motion

Animation freezes under reduced motion on every platform. Stipple reads the setting from:

Target	Source
Android	`ValueAnimator.areAnimatorsEnabled()`, and Compose’s `MotionDurationScale`, which is 0 when animations are off.
iOS	Reduce Motion in Accessibility settings.
wasmJs	The `prefers-reduced-motion: reduce` media query.
JVM desktop	No system source: motion is full unless you override it.

You can override it with LocalStippleMotion (System, Full or Reduced). Read the resolved value with isStippleMotionReduced().

A frozen field is drawn at the modifier’s stillTime. Progress and value changes still update, because they are information, not decoration.

DitherText keeps text readable. If the contrast between ink and paper falls below minContrast (4.5 by default), it swaps the ink for black or white. theme.contrastRatio gives the ratio for any theme.

DitherEffectText shows its finished text at once under reduced motion, and a screen reader always reads the final text, never a scrambled frame.

Keep the field’s tone under about 0.5 where text sits on a dithered background.

Semantics

Components expose normal semantics:

DitherButton has a button role, focus and press states, and its text.
DitherProgressBar and DitherGauge report their value as a range.
DitherBarChart, DitherGrid and DitherGauge take a contentDescription, and DitherStatCard describes its label, value and delta as one element.
DitherImage and DitherAvatar take a description or a name.

A plain Modifier.dither is decoration and is invisible to screen readers. If it carries meaning, give the element its own semantics.