For OS: Mac OS X EI Capitan, Version(10.11.6) Mac mini (Late 2012)

Alerts:
Check and Verify the Notification Alert Displayed on MAC OS

1) Install any M59+ chrome
2) Navigate to Test URL: https://tests.peter.sh/notification-generator/#requireInteraction=true
3) Grant Permission to Display Notifications from the Bubble Displayed
4) Click on Display the Notification Button Displayed on the Page

Expected:
1. Notification Alert should be immediately displayed with the required content in it (Banner Details, Icon image, Close and Settings Button)
2. And Notification should not be disappeared unless clicked or closed by the user.

Actual:Notification bubble/Alert doesn’t appear after clicking on “Display the notification” button

Note: Alert testcase works fine on ‘M 60’ (60.0.30.82.0 Official Build)  for Mac OS X EI Capitan, Version(10.11.6) Mac mini (Late 2012)

Deleted: Actual_Mac mini 10.11.6.mov 4.3 MB

Actual_Mac mini 10.11.6.mov 4.3 MB Download

can you trigger notifications from other apps? It seems you are unable to trigger them at all

Also can you reboot and try again? I have seen the Notification center throttle banners. 

Does the banner cases work on El Capitan? 

With respect to comment #2:
MAC SIERRA 10.12.3 DESKTOP

Other App like Notification Galore :https://chrome.google.com/webstore/detail/notifications-galore/gclcddgeeaknflkijpcbplmhbkonmlij/related?utm_source=chrome-ntp-launcher  and https://tests.peter.sh/notification-generator/  works on Yellow Canary build (unofficial build) ,notification is shown but does not seen on Notification Centre with or without ‘Enable native notifications’ flag.

Whereas Above app Notification Galore and https://tests.peter.sh/notification-generator/ does not work on Latest Chrome Version:59.0.3071.29 & 60.0.3083.0 Official build (i.e. No notification is shown and not even on Notification Centre with or without ‘Enable native notifications’ flag.

M 58 ( 58.0.3029.81)
But works on  Stable build:58.0.3029.81 (Official build)
1. Without ‘Enable native notifications’ flag , https://tests.peter.sh/notification-generator/ and Notification Galore apps works. (i.e.notification is seen but not seen in Notification Centre)
2.But with ‘Enable native notifications’ flag , https://tests.peter.sh/notification-generator/ does not work but Notification Galore app works (i.e. No notification is shown and not even on Notification Centre 


For El Capitan
BANNER,Buttons,Do not Disturb works ,only Alert does not works on ‘M59’ and ‘M60’

Ok I have tried with both El Capitan (10.11.6) Sierra (10.12.4) and Maveriks (10.9.5)
In all of these platforms I have tried with Chrome 59.3071.29 and Chrome Canary (various flavours of 60.*)

Since all the versions in question are fairly new I have not touched the flag and verified chrome://flags#enable-native-notifications is set to Default.

Then I have tried both alerts and banners from tests.peter.sh and chrome notifications from the notification galore chrome app


All of the seem to work as expected, have found no issues whatsoever. I know they are not the exact same versions you have tried but I don't have access to those.

Given I have not had a single snag I think this must be related to your setup so I am going to close the bug. 

Can you try a few things just in case?

1) Go to Notification Settings (via notfication center and the cog) and verify that Chrome alerts are enabled (with the right defaults)

2) Can you set the flag to default and reboot both chrome and the computer?