request for that message and some clients will render it as a black line, but by editing the source it's possibly for homeserver to not respect it and do nothing. If the room is bridged to protocols that don't support message removals (IRC, XMPP), their users see nothing happening. Don’t say anything you wouldn’t want to remain in the chat forever.</p>

<h4>Why do XMPP users keep joining and leaving all the time?</h4>
<p><a href="https://github.com/matrix-org/matrix-bifrost/issues/63">It's an issue with