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19. These guidelines detail the API and provide an excellent source of hints and tips for maximising the user experience with your apps.Apple also provide some helpful guidance on testing the accessibility on your app with Voiceover20Windows Phone 8 App AccessibilityIt is fair to say that Microsoft have been playing catch up with iOS and Android as far as accessibility features go. They rolled out some good support for magnification, text enlargement and changing of colours and in Windows Phone 8.1 things have 19 developer.apple.com/library/ios/#documentation/UserExperience/Conceptual/iPhoneAccessibility20 developer.apple.com/library/ios/technotes/TestingAccessibilityOfiOSApps/TestAccessibilityonYourDevicewithVoiceOver/TestAccessibilityonYourDevicewithVoiceOver.html
219Accessibilitymoved on again. There is now a screen reader called Narrator in Windows Phone 8.1, albeit still in beta. It reads out text in synthetic speech and like other phone screen readers, it makes use of its own specific gestures. It is designed for users with little or no vision but it still needs enhancing to be as comprehensive as the iOS and Android offerings. It can only be used with some core functionality and navigation functionality and is not as fully featured as other phone screen readers. At the time of writing it is only available with the US English display, keyboard and speech language settings. However, this is certainly one to watch for the future!Some of the accessibility features on Windows Phone 8/8.1 include but are not limited to:—Narrator- this screen reader is in beta, has limited functionality and is only available on 8.1 —Text Size- the size of text can be enlarged to aid those with learning difficulties or users who are partially sighted—High Contrast Theme- this theme changes text to black and white and provides a solid background behind words that would otherwise be on top of pictures.This is helpful for partially sighted users and some users with learning disabilities—Screen Magnifier- this feature is for partially sighted people who wish to magnify the text on the screen and change the zoom level. It has its own gestures.—Speech for phone accessibility- the user can make calls, search the web, open apps or listen to text messages with Speech. This is helpful for a broad range of people in dif-ferent situations, including those with motor impairments, learning disabilities and those with a visual impairment.—Customize browser captions- It is possible to change the font size, color and background transparency of captions
220Accessibilityin Internet Explorer and also apps that make use of the browser. This is helpful for people with hearing loss that may also have some vision loss—TTY support- this device allows people who have hearing loss or who are speech impaired to type messages to anyone else who has a TTY, using a telephone line.