We do indeed have what essentially is a text-editor with Guardian specific features developed in house. It's used for all of our content, but specifically what

We do indeed have what essentially is a text-editor with Guardian specific features developed in house. It's used for all of our content, but specifically what you're referring to are liveblogs, where a journalist can write short content and append it to the existing article. Here's an example of such an article https://www.theguardian.com/world/live/2020/apr/23/coronavirus-live-news-update-covid-19-face-masks https://www.theguardian.com/world/live/2020/apr/23/coronavir...