Remove deprecated IE11 attachEvent fallback

gsoc 1 · gsoc 1 · commit 740668a1153e · 2026-01-25T20:25:37.000+05:30
Since IE11 reached end-of-life in June 2022, the window.attachEvent fallback in the message event listener registration is no longer needed. All modern browsers support addEventListener. This simplifies the code by removing the conditional check and using addEventListener directly. Fixes #2970
diff --git a/modules/xmpp/moderator.js b/modules/xmpp/moderator.js
@@ -107,11 +107,7 @@ export default class Moderator extends Listenable {
         }
 
         // Register
-        if (window.addEventListener) {
-            window.addEventListener('message', listener, false);
-        } else {
-            window.attachEvent('onmessage', listener);
-        }
+        window.addEventListener('message', listener, false);
     }
 
     /**

Original file line number	Diff line number	Diff line change
`@@ -107,11 +107,7 @@ export default class Moderator extends Listenable {`
`107`	`107`	`}`
`108`	`108`
`109`	`109`	`// Register`
`110`		`- if (window.addEventListener) {`
`111`		`- window.addEventListener('message', listener, false);`
`112`		`- } else {`
`113`		`- window.attachEvent('onmessage', listener);`
`114`		`- }`
	`110`	`+ window.addEventListener('message', listener, false);`
`115`	`111`	`}`
`116`	`112`
`117`	`113`	`/**`