So does this mean Chrome will also follow the Firefox notifications behavior whereby a notification appears for 5 seconds and then just disappears without any trace? Or will notifications continue to stay visible until manually dismissed (either by the user or by the app)?<p>Without some kind of notification center, either approach would make for a rather poor experience for users in my opinion. The former means users coming back from idling will have no indication whatsoever that they have new notifications waiting to be read, and the latter means notifications could quickly clutter up the screen and users will need to manually dismiss each and every notification that appears (how would users be able to easily dismiss multiple notifications without some kind of notification center?).<p>Perhaps browsers could delegate to native notification APIs in OSes that offer them instead of building out their own implementations? This is what Chrome for Android does for web notifications and it works quite well in my experience.