Pull request merged today into CSS MQ5. https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-transparency iOS API: BOOL UIAccessibilityIsReduceTransparencyEnabled(void); NSString *const UIAccessibilityReduceTransparencyStatusDidChangeNotification; macOS API: BOOL accessibilityDisplayShouldReduceTransparency(void); NSString *const NSWorkspaceAccessibilityDisplayOptionsDidChangeNotification;
<rdar://problem/33858673>
Pull request: https://github.com/WebKit/WebKit/pull/11560