id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc	focuses	prnumber
35210	Add notification area to Customizer	westonruter	westonruter	"There is currently no standard location for showing notifications in the Customizer, whether success messages or failures. Currently in the Customizer, if there is a failure to save due to a server error or connectivity problem, there is no visual indicator that a failure happened other than that the Save & Publish button doesn't get disabled. When an error does happen, there should be an error message displayed there.

In #34893, validation constraints are added to settings in the customizer. When validation constraints fail, the error messages should be shown in the notification bar. Likewise, in #34923 there is a proposal to be able to create new pages in the Customizer: the first iteration is just to add new blank pages with only the title supplied, and upon saving we need to be able to provide edit post links for those new pages so that the body content can be fleshed out. These links can be displayed in a notification bar. (These links can also be included in the nav menu item controls.)

The notification bar should facilitate plugins to inject their own messages and indicate failures vs successes. 

Tickets dependent on the notification area:

* #29932: There is no error reporting in the Customizer
* #31582: Catching PHP Fatal Errors on WordPress Theme Customizer
* #34893: Improve Customizer setting validation model
* #34923: Introduce basic content authorship in the Customizer"	enhancement	closed	normal	4.9	Customize		normal	fixed	has-patch has-dev-note		ui, javascript