Google Chrome 66.0.3349.0 (Official Build) canary (64-bit) (cohort: 64-Bit) 
Google Chrome 64.0.3282.167 (Official Build) (64-bit) (cohort: Stable)
Windows 10 Enterprise Version 1607
NVDA 2017.4
macOS Sierra 10.12.6 with VoiceOver 7.0

Report from dsexton@

It is not clear if the 'remove' button will simply cancel what I am adding or will remove this page from existing bookmarks if it exists.
When the edit button is pressed, I expect that after editing, I will be returned to the initial bookmark dialog, but instead I am expelled from both dialogs without a clear idea if the bookmark was created or not.
It would be helpful if the screen reader announced the action that took place when the dialog is closed such as 'bookmark created' 'cancelled'