I thought this was implemented a while ago:
<a href="https:&#x2F;&#x2F;developers.google.com&#x2F;web&#x2F;updates&#x2F;2015&#x2F;03&#x2F;push-notifications-on-the-open-web?hl=en" rel="nofollow">https:&#x2F;&#x2F;developers.google.com&#x2F;web&#x2F;updates&#x2F;2015&#x2F;03&#x2F;push-notif...</a><p>The link tells that this was implemented in Chrome 42.