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Hello,
There is a popup that appears when pressing the Enter key on an existing appointment. This popup contains the "Edit" and "Delete" buttons and is like a dialog. It even includes a close button. However, there are no aria roles or attributes in this widget to communicate to screen readers that it is a dialog.
If this popup is intended to be a dialog, then the lack of aria would be an accessibility issue per the WCAG 4.1.2 criterion.
I tested and reproduced this in your demo located here:
https://blazor.syncfusion.com/demos/scheduler/overview?theme=fluent
If you need more information, please let me know. Thank you!
Ken Watson