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Any page that has a JavaScript function named "top()" in it causes JavaScript to fail. The function doesn't need to be called or even contain anything. eg. function top() { } JavaScript just locks up. This affects iOS17.2 and macOS 14.2 If occurs in Safari and any app using WKWebView This is a critical bug that affects sites and apps in the wild. I suggest there is something very wrong with the Javascript engine in general if certain function names can cause such a failure. Does anyone else have other function names that cause this failure?

My code used to work on iOS versions prior to iOS16, but it no longer does. I am running iPadOS -not checked on iPhones. A view based on WKWebView is supposed to show HTML files inside a keyboard extension. It is now not not displaying correctly and any Javascript will lock up the UI. Setting stringByEvaluatingJavaScriptFromString > evaluateJavaScript's completionHandler to nil fixes this, but Javascript is not run. No errors, but blank space. Any ideas?