The Readability category contains criteria that determine how easily a user can read and modify the text within your app. Users with limited vision and users with specific viewing needs will need to be able to clearly read and understand all the text content within the app, without the app interfering with user preferences.
Readability accessibility criteria include:
The goal of this testing category is to ensure that a user navigating and interacting with your app can clearly read and understand the content of the app based on their preferences. Providing images with alternative (alt) text and using headings (H1, H2, etc.) to break up lengthy screens of content will help assistive technology users such as screen reader users more effectively navigate and understand your app. The app should also be usable in both portrait and landscape orientations, and text should be able to be resized based on user preferences. At the very least, the app should not prevent the user from changing their device orientation or zooming.