Add message for when chromium hard reload bug breaks things

emu.js

@@ -347,6 +347,16 @@ class Emulator {
 }
 
 window.addEventListener('DOMContentLoaded', () => {
-	document.getElementById('output').innerText = '';
+	const output = document.getElementById('output');
+	output.innerText = '';
+
+	if (!self.crossOriginIsolated) {
+		output.innerText = "Yeah so there's this thing where Chromium ends "
+			+ "up ignoring COOP/COEP\nheaders after a hard reload "
+			+ "sometimes, and I haven't been able to\nfigure out how to "
+			+ "work around it yet.  If you just wait a little while\nand "
+			+ "then reload normally then hopefully it should work haha";
+	} else {
 		window.emu = new Emulator();
+	}
 });