Bug [Safari]: when closing overlay, focus returns to entire table instead of last point of regard

Summary of original comment thread:

Scenario: Closing overlays on the Manage Users page (when opened via mouse click)

Expected behavior: returns focus to button that opened overlay

Actual behavior: returns focus to entire table

This issue only appears in Safari, and only when opening the overlay with mouse clicks. Other browsers work as expected, and opening overlays by tabbing in Safari works as expected.

Acceptance Criteria

• Closing overlay returns focus to last point of regard (whatever element that opened overlay) for Safari
• Fix does not affect Chrome or Firefox