Techniques for enabling push notifications from websites are described. In at least some embodiments, a push notification generally represents a way for a website to push information to a client device. For instance, a push notification may include content (e.g., text, images, video, audio, and so forth) that a website pushes to a client device. The content can be output via the client device, e.g., independently of an output of the website itself. According to one or more embodiments, a push notification channel is generated that enables notifications to be pushed from a website to a client device. Generally, a push notification channel represents a set of attributes and procedures that enable notifications to be securely and accurately pushed from a website to a client device.