onSecondaryContainer property Null safety
A color that's clearly legible when drawn on secondaryContainer.
To ensure that an app is accessible, a contrast ratio between secondaryContainer and onSecondaryContainer of at least 4.5:1 is recommended. See www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html.
Implementation
Color get onSecondaryContainer => _onSecondaryContainer ?? onSecondary;