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in a modal dialog can the tab focus go to the browser UI?

for

From: Ramakrishnan Subramanian
Date: Jan 31, 2017 11:19AM


Dear members,
I kindly request your inputs on the following scenario as per the WCAG
guideline and aria authorization practice:

Actual behavior:
In a modal dialog while navigating using tab /shift tab keys: though
the focus is trapped inside the dialog, when we hit tab key from the
last focusable element inside the dialog, the focus is going to the
browser UI.
Expected behavior:
1. When we hit tab from the last focusable element, the focus should
go to the first focusable element inside the dialog.
2. when we hit shift tab from the first focusable element, the focus
should go to the last focusable element inside the dialog.

Is this only a best practice? Or
Is this mandatory to pause wecag guidelines?

: should we flag this as bug as per wcag and aria authorization?
If the developers feel that this is something which is a browser
behavior which need not be altered.
Is that fine?

Thanks and Regards,
Ramakrishnan