added warning for unsupported browsers

global/globalScript.js

@@ -147,12 +147,33 @@ function setVh() {
 }
 
 
+function getEngine() {
+	if ("MozAppearance" in document.documentElement.style)
+		{ return "gecko" }
+
+	if (
+		window.chrome &&
+		CSS.supports("-webkit-appearance", "none") &&
+		!CSS.supports("-apple-pay-button-style", "black")
+	) { return "blink" }
+
+	if (CSS.supports("-apple-pay-button-style", "black"))
+		{ return "webkit" }
+
+	return "unknown";
+}
+
+
 document.addEventListener("DOMContentLoaded", async function () {
 	setVh()
 	debugPrint("currentPage", `${CURRENT_PAGE} ${Object.keys(PAGES)[CURRENT_PAGE + 1]}`)
 
 	startLoadingScreen()
 
+	let engine = getEngine()
+	if (!["gecko", "blink"].includes(engine))
+		{ alert("Your web browser is not supported, expect major issues.\nRendering engine:" + engine) }
+
 	setLoadingProgress("Fetching tips...")
 
 	await loadTips()