--- a/src/chat.js	Mon Sep 15 13:29:10 2025 -0600
+++ b/src/chat.js	Tue Sep 16 00:01:53 2025 -0600
@@ -284,7 +284,7 @@
 }
 
 function heartbeat() {
-	let url = `heartbeat.js?last_update=${lastUpdate}`;
+	let url = `heartbeat.js?last_update=${lastUpdate}&focus=${document.hasFocus()}`;
 	if( currentChatId )
 		url += `&chat=${currentChatId}`;
 	ajax(url);

--- a/src/heartbeat.js.luan	Mon Sep 15 13:29:10 2025 -0600
+++ b/src/heartbeat.js.luan	Tue Sep 16 00:01:53 2025 -0600
@@ -20,6 +20,8 @@
 local get_online = Online.get or error()
 local Chat = require "site:/lib/Chat.luan"
 local get_chat_by_id = Chat.get_by_id or error()
+local Notify = require "site:/lib/Notify.luan"
+local notify_active = Notify.active or error()
 local Logging = require "luan:logging/Logging.luan"
 local logger = Logging.logger "heartbeat.js"
 
@@ -47,6 +49,11 @@
 		return
 	end
 
+	local focus = Http.request.parameters.focus or error()
+	if focus == "true" then
+		notify_active(user)
+	end
+
 	local online = get_online(user)
 %>
 	online = <%=json_string(online,compressed)%>;