docs: Document printable conversations.

help/include/sidebar_index.md

@@ -104,6 +104,7 @@
 * [View messages sent by a user](/help/view-messages-sent-by-a-user)
 * [Link to a message or conversation](/help/link-to-a-message-or-conversation)
 * [Searching for messages](/help/search-for-messages)
+* [Printing messages](/help/printing-messages)
 * [View message Markdown source](/help/view-the-markdown-source-of-a-message)
 * [View when message was sent](/help/view-the-exact-time-a-message-was-sent)
 * [View a message's edit history](/help/view-a-messages-edit-history)

help/printing-messages.md

@@ -0,0 +1,37 @@
+# Printing messages
+
+Zulip [conversations](/help/recent-conversations) are printable from the
+Zulip web app. So is any other message feed view, including
+[searches](https://zulip.com/help/search-for-messages).
+
+{start_tabs}
+
+{tab|web}
+
+1. Navigate to a stream, topic, or direct message view.
+
+1. Ensure that all messages you wish to print from further back in time
+   have been loaded and can be scrolled to on screen (all loaded messages
+   will print).
+
+1. Use your browser's print feature (e.g., File > Print) to preview
+   and print your messages.
+
+{end_tabs}
+
+Messages will print beginning with the oldest loaded message you can see on
+screen. If you need your printout to include messages from further back in time,
+you'll need to scroll up through the message history until you can see the
+messages you wish to print.
+
+Conversation printouts exclude sidebars and other interface features that you
+otherwise see on screen. And whether you're viewing Zulip in the [light or dark
+theme](/help/dark-theme), Zulip message views will print with appropriate colors
+for paper or system-generated PDFs. Background colors will not be printed.
+
+## Related articles
+
+* [Reading topics](/help/reading-topics)
+* [Reading direct messages (DMs)](/help/reading-dms)
+* [Dark theme](/help/dark-theme)
+* [Supported browsers](/help/supported-browsers)