Every month or so, Twitter releases a list with a roundup of the updates made to its PWA experience over the past few weeks. The changelog for June is available today, and it includes a couple of new features, but also some sad news if you're still using Internet Explorer. In terms of new features, there's newly-added support for tweet drafts, which can be saved for later. This feature was announced separately late last month and should already be available to most users.
Another major new feature is the new quick access panel for DMs. For a small number of users on widescreen displays, it should be possible to access your messages from a panel in the bottom right of the page, without leaving the current page. Another new feature is the ability to customize Lists with a custom banner image.