Ionic 8.4 introduces significant updates to enhance core components such as Alert, Select, and Segment, alongside improved accessibility and developer experience. Noteworthy features include the addition of a Modal interface for Select components, enabling more flexible user interactions, and new swipeable Segment Content components that facilitate responsive, tab-like experiences. Menu event handling is refined with additional role data for enhanced menu interaction flexibility, while accessibility improvements focus on screen reader compatibility and logical heading structures in the Alert component. Other enhancements include improved screen reader support for inputs and overlays, bug fixes for navigation issues in Vue, and standalone Tabs components in Vue and React, eliminating the router dependency for simpler integration. These updates aim to provide a fast, accessible, and developer-friendly framework, aligning with Ionic's mission to evolve with user needs.