Amazon Connect CCP ↔ Custom UI Component: Is Screen Reader Support Guaranteed?

The goal is to ensure that agents using Amazon Connect’s Contact Control Panel (CCP) with screen readers can interact with both the default controls and any custom UI elements added through the SDK. The default CCP implements ARIA attributes for core call controls and status indicators, and offers keyboard navigation and high‑contrast mode. However, the SDK documentation states that developers must explicitly add ARIA labels to custom components for full accessibility coverage. This raises uncertainty about whether screen readers will automatically recognize custom widgets or if they will be inaccessible without manual ARIA implementation. Additionally, high‑contrast and text‑size adjustments may not propagate to third‑party widgets, potentially creating gaps in visual accessibility. The following questions remain:
1. Does the Amazon Connect SDK automatically apply ARIA roles to custom components, or is explicit labeling required in every version?
2. Will high‑contrast mode and text‑size settings reliably affect custom widgets embedded in the CCP?
3. Are there known browser‑specific differences in screen‑reader behavior for custom CCP components?