From 86f8898ee4d65d90bdd65b83f50527b7332d3760 Mon Sep 17 00:00:00 2001
From: "G.Ambatte" <sean@robertson-family.nz>
Date: Sun, 12 Apr 2026 18:24:41 +1200
Subject: [PATCH] Check if Navigation API exists, use setInterval if not

---
 client/homebrew/brewRenderer/brewRenderer.jsx | 25 ++++++++++++++-----
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/client/homebrew/brewRenderer/brewRenderer.jsx b/client/homebrew/brewRenderer/brewRenderer.jsx
index efdfce5c9..02ec20050 100644
--- a/client/homebrew/brewRenderer/brewRenderer.jsx
+++ b/client/homebrew/brewRenderer/brewRenderer.jsx
@@ -135,6 +135,7 @@ const BrewRenderer = (props)=>{
 
 	const mainRef  = useRef(null);
 	const pagesRef = useRef(null);
+	const urlRef = useRef('');
 
 	if(props.renderer == 'legacy') {
 		rawPages = props.text.split(PAGEBREAK_REGEX_LEGACY);
@@ -272,12 +273,24 @@ const BrewRenderer = (props)=>{
 	const frameDidMount = ()=>{	//This triggers when iFrame finishes internal "componentDidMount"
 		scrollToHash(window.location.hash);
 
-		navigation.addEventListener('navigate', (e)=>{
-			if(e.hashChange && e.destination.sameDocument){
-				const dest = e.destination.url.slice(e.destination.url.indexOf('#'));
-				scrollToHash(dest);
-			}
-		});
+		if(navigation) {
+			navigation.addEventListener('navigate', (e)=>{
+				if(e.hashChange && e.destination.sameDocument){
+					const dest = e.destination.url.slice(e.destination.url.indexOf('#'));
+					scrollToHash(dest);
+				}
+			});
+		} else {
+			urlRef.current = window.location.href;
+			setInterval(()=>{
+				if(window.location.href != urlRef.current){
+					urlRef.current = window.location.href;
+					const tmpURL = new URL(window.location.href);
+					const target = tmpURL.hash;
+					scrollToHash(target);
+				}
+			}, 1000);
+		};
 
 		setTimeout(()=>{	//We still see a flicker where the style isn't applied yet, so wait 100ms before showing iFrame
 			renderPages(); //Make sure page is renderable before showing