Verify your app in high contrast
Use your app while a high-contrast theme is active to verify that all the UI elements display correctly. All text should be readable, and all images should be clear. Adjust the XAML theme-dictionary resources or control templates to correct any theme issues that come from controls. In cases where prominent high-contrast issues are not coming from themes or controls (such as from image files), provide separate versions to use when a high-contrast theme is active.
Verify your app with display settings
Use the system display options that adjust the display's dots per inch (dpi) value, and ensure that your app UI scales correctly when the dpi value changes. (Some users change dpi values as an accessibility option, it's available from Ease of Access as well as display properties.) If you find any issues, follow the Guidelines for layout scaling and provide additional resources for different scaling factors.
Verify main app scenarios by using Narrator
Use Narrator to test the screen reading experience for your app by performing the following steps:
Use these steps to test your app using Narrator with a mouse and keyboard:
Start Narrator by pressing Windows logo key + Enter.
Navigate your app with the keyboard by using the Tab key, the arrow keys, and the Caps Lock + arrow keys.
As you navigate your app, listen as Narrator reads the elements of your UI and verify the following:
For each control, ensure that Narrator reads all visible content. Also ensure that Narrator reads each control's name, any applicable state (checked, selected, and so on), and the control type (button, check box, list item, and so on).
If the element is interactive, verify that you can use Narrator to invoke its action by pressing Caps Lock + Spacebar.
For each table, ensure that Narrator correctly reads the table name, the table description (if available), and the row and column headings.
Press Caps Lock + Enter to search your app and verify that all of your controls appear in the search list, and that the control names are localized and readable.
Turn off your monitor and try to accomplish main app scenarios by using only the keyboard and Narrator. To get the full list of Narrator commands and shortcuts, press Caps Lock + F1.