realtime

 Realtime  generally refers to a user experience where content is updated live; for example: a new comment shows up on a page while you're viewing it, or chat notification "your friend is typing a message."

Examples

 * Home page / feed posts: How to set up your realtime feed
 * Permalinks / Post responses: E.g. displaying comments in realtime as received

Sweetroll


sweetroll has basic realtime support — when the current page is changed, a "reload this page" box appears.

Since Sweetroll knows what feeds are affected by the creation/edit of an entry, this works with categories, tag feeds, as well as the entry's own page. The notifications are delivered via server-sent events, using a tiny web component that unhides itself when a notification that mentions the current page is received.

Facebook
Facebook shows (since mid 2016?) when someone is writing a comment on your post, in real time as they’re presumably typing:



Screenshot of the bottom of a note post on a Facebook profile, with the additional message between the webactions buttons and the comment text field:
 * "... A friend is typing a comment…"

GitHub
GitHub issues show new comments as they are made. I.e. if you are viewing a GitHub issue and are scrolled down to the bottom of the comments, you will see new comments just show up in realtime.


 * : I was writing a comment on a GitHub issue when a new comment appeared. The entire comment including avatar and username faded in quickly. The display of the comment was otherwise the same as other comments — no special highlighting or border.