Thread 0 Crashed: 0 WebKit 0x00000001a1b6bf1c WKMouseDeviceObserver.connectedDeviceCount.setter + 68 (WKMouseDeviceObserver.swift:0) 1 WebKit 0x00000001a1b6bea4 @objc WKMouseDeviceObserver.connectedDeviceCount.setter + 152 2 WebKit 0x00000001a1b6d95c closure #2 in WKMouseDeviceObserver.start() + 80 (WKMouseDeviceObserver.swift:0) 3 WebKit 0x00000001a1b4e3e9 <deduplicated_symbol> + 1 4 WebKit 0x00000001a1b4e139 <deduplicated_symbol> + 1 5 WebKit 0x00000001a1b4e769 <deduplicated_symbol> + 1 6 libswift_Concurrency.dylib 0x0000000196037cdd completeTaskWithClosure(swift::AsyncContext*, swift::SwiftError*) + 1 (Task.cpp:546)

I have compiled some Java code to WebAssembly via TeaVM and wrapped it in a PWA. The resulting code runs nicely in Firefox and Chrome but throws an exception in Safari. CompileError: WebAssembly.Module doesn't parse at byte 1657: invalid extended GC op 24, in function at index 2251 Can anybody tell me what's wrong with that code? I mean it can't be so bad if Firefox and Chrome can parse and run it without problems. I am using the most recent versions of all browsers and the offending code can be found here: Run the demo via: https://mpmediasoft.de/demos/Emmentaler/Emmentaler-Demo-TeaVM-Wasm/index.html The offending wasm file is: https://mpmediasoft.de/demos/Emmentaler/Emmentaler-Demo-TeaVM-Wasm/tvw/ModelBridgeTeaVM.wasm With Safari the demo just shows some empty space instead of a complex polygon. You can see the error in the javascript console of Safari.

Hi, How are we supposed to handle links with target="_blank" in the new SwiftUI WebView? I don't see anything in WebPage.NavigationDeciding or elsewhere that corresponds to the delegate method used for WKWebView.

Hi all , I have 2 questions regaridng App Clips. 1 - can we directly invoke App Clips from a HTML Appclip experience url ? We want to directly take users to the App Clips flow without showing App Clips cards or banner. 2 - Does Apple have a plan to support other modern mobile browsers such as Chrome , Edge and Firefox ?

The “Add to Home Screen” feature for bookmarks is not working in Safari on iOS 26.

Since iOS 18.1 launched as a beta, we've been getting reports from end users on iPhone 15 Pro and iPhone 15 Pro Max specifically. They're reporting that our WebView is unable to load our local HTML content. I'm curious if anyone else has had their app or users run into this issue? So far I've tried installing the most recent XCode Beta 16B5014f and installed an 18.1 emulator, but our app worked fine. It's also working fine on all my real devices, but we don't have a 15 Pro to test on. I'm curious if this is related to the processor on these devices and how they are intended to support Apple's new AI coming in 18.1.

In the safari or chrome app, when I want to change tabs, I can go into a grid view of the tabs. In this grid, each tab shows the content of the page. When I click on one of the tabs, the content of the page expands to fill the entire screen (and shrinks when I go back to grid). I'm creating my own browser and I'm trying to replicate this same functionality. I'm using WebKit on XCode 16.4, iOS 18. However, I'm unable to figure out how Chrome and Safari did this. First, I thought that I could take a snapshot of the page and then use that image as the thumbnail. However, very often the image is of the wrong size - likely due to the webview shrinking for the animation. Making the animation wait until the image is made available did help in making it more consistent. The above errors happen whenever I spam the new tab and then click the tab grid button. It only is misaligned on the very last new tab. Please help on this. // OpenedTab.swift Button(action: { tab.getThumbnail { tabManager.selectedTab = nil } }) { ZStack { Image(systemName: "square") .resizable() .frame(width: 25, height: 25) Text(tabManager.tabs.count.description) .font(.subheadline) } } // TabState.swift func getThumbnail(completionHandler: (() -> Void)? = nil) { webView.takeSnapshot(with: nil) { img, err in if let err = err { print("Snapshot err: \(err)") } else { self.thumbnail = img completionHandler?() } } } Also, something I'm noticing is that for some reason, the image is slightly bigger than the header of the tab card. It also happens in the progress view if the thumbnail isn't available. The images above show it too. I have no clue why this is happening and I would love advice on this too. struct TabCardView: View { @StateObject var manager = TabManager.shared @ObservedObject var tab: TabState var namespace: Namespace.ID @State var width: CGFloat = 0 var body: some View { GeometryReader { geo in VStack(spacing: 0) { HStack(spacing: 1) { Text(tab.title ?? tab.url.host() ?? "") .font(.caption2) .padding(.horizontal, 4) .padding(.vertical, 10) Button(action: { manager.close(tab: tab) }) { Image(systemName: "multiply") } } .frame(height: 40) .frame(width: geo.size.width) // .padding(.horizontal, 7) .background(.tertiary) .matchedGeometryEffect(id: tab.id.uuidString + "title", in: namespace) ZStack { if let thumbnail = tab.thumbnail { Image(uiImage: thumbnail) .resizable() .aspectRatio(contentMode: .fill) .frame(width: geo.size.width, height: 160, alignment: .top) .clipped() } else { Color.black.brightness(0.8) ProgressView() } } .frame(width: geo.size.width, height: 160) .matchedGeometryEffect(id: tab.id.uuidString + "container", in: namespace) } .frame(width: geo.size.width) } .frame(height: 200) .clipShape(RoundedRectangle(cornerRadius: 16)) .shadow(radius: 2) .padding(.all, 7) .overlay( RoundedRectangle(cornerRadius: 20) .stroke(.blue, lineWidth: manager.previousTab?.id == tab.id ? 5 : 0) ) .shadow(radius: 1) } }

(1) Context: Our project has a login feature via WEBVIEW (using SFSafariViewController) and integrates PassKey on the Web side. The app listens for a successful login by capturing the redirect URL via the delegate of SFSafariViewController. (2) Issue: On iOS < 18.4: The redirect URL is captured with full parameters returned. https://xyz.com/home?session_state=...&code=... On iOS ≥ 18.4: The redirect URL is captured successfully but missing parameters. https://xyz.com/home We currently suspect that the issue originates from the SFSafariViewController framework after the release of iOS 18.4. Has anyone experienced a similar issue? We would also appreciate support from the Apple team.

I have a website that has been built in Wordpress and hosted on wordpress engine. In testing now and on the i phone with safari browser it keeps crashing after short time 2/3 minutes, content does not display properly pages go blank etc. Has anyone experienced this /have a solution? Thanks

Hi, I’m working on a Safari extension for macOS, and I’d like the app to use specific system notification settings right after installation. I’m wondering if there’s a way in Swift to programmatically configure the default notification preferences (as seen in System Settings > Notifications > [my app]). Here are the desired settings: Only Desktop – without “Notification Center” or “Lock Screen” Alert Style: Temporary Badge App Icon: Enabled Play Sound for Notifications: Disabled Show Previews: When Unlocked Notification Grouping: Off (I don’t want them to accumulate in Notification Center) Here is the code I’m currently using to display a basic notification: private func handleNotificationRequest(_ message: [String: Any]) { guard let title = message["title"] as? String, let body = message["body"] as? String else { return } UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound]) { granted, error in if granted { self.showNotification(title: title, body: body) } } } private func showNotification(title: String, body: String) { let content = UNMutableNotificationContent() content.title = title content.body = body content.sound = nil // No sound for subtle notification // Create notification that doesn't persist in notification center let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 0.1, repeats: false) let request = UNNotificationRequest(identifier: "fast-url-copy-notification", content: content, trigger: trigger) UNUserNotificationCenter.current().add(request) { error in if let error = error { os_log(.error, "Failed to show notification: %@", error.localizedDescription) } } } OS: macOS 26.0 Thanks in advance, Mateusz

Hi there, I'm experiencing several crashes on JavaScriptCore pas_panic_on_out_of_memory_error, only on devices with tvOS 15.4 and 15.4.1. This happens with users using the app for several hours as well as 5 seconds after launching the app. Devices: AppleTV6,2 and AppleTV5,3 Thread 14 — JavaScriptCore pas_panic_on_out_of_memory_error (JavaScriptCore) JavaScriptCore bmalloc_try_iso_allocate_impl_impl_slow (JavaScriptCore) JavaScriptCore bmalloc_heap_config_specialized_local_allocator_try_allocate_small_segregated_slow (JavaScriptCore) JavaScriptCore bmalloc_allocate_impl_casual_case (JavaScriptCore) JavaScriptCore ***::String::String(char16_t const*, unsigned int) (JavaScriptCore) JavaScriptCore JSC::LiteralParser<char16_t>::parsePrimitiveValue(JSC::VM&) (JavaScriptCore) JavaScriptCore JSC::LiteralParser<char16_t>::parse(JSC::ParserState) (JavaScriptCore) JavaScriptCore JSC::jsonProtoFuncParse(JSC::JSGlobalObject*, JSC::CallFrame*) (JavaScriptCore) JavaScriptCore llint_entry (JavaScriptCore) JavaScriptCore llint_entry (JavaScriptCore) JavaScriptCore llint_entry (JavaScriptCore) JavaScriptCore llint_entry (JavaScriptCore) JavaScriptCore vmEntryToJavaScript (JavaScriptCore) JavaScriptCore JSC::Interpreter::executeCall(JSC::JSGlobalObject*, JSC::JSObject*, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (JavaScriptCore) JavaScriptCore JSC::boundThisNoArgsFunctionCall(JSC::JSGlobalObject*, JSC::CallFrame*) (JavaScriptCore) JavaScriptCore vmEntryToNative (JavaScriptCore) JavaScriptCore JSC::Interpreter::executeCall(JSC::JSGlobalObject*, JSC::JSObject*, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (JavaScriptCore) JavaScriptCore JSC::profiledCall(JSC::JSGlobalObject*, JSC::ProfilingReason, JSC::JSValue, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (JavaScriptCore) JavaScriptCore JSObjectCallAsFunction (JavaScriptCore) JavaScriptCore -[JSValue invokeMethod:withArguments:] (JavaScriptCore) ITMLKit -[IKJSObject invokeMethod:withArguments:] (ITMLKit) ITMLKit -[IKJSEventListenerObject invokeMethod:withArguments:thenDispatchEvent:extraInfo:] (ITMLKit) ITMLKit __43-[IKJSXMLHTTPRequest setRequestReadyState:]_block_invoke (ITMLKit) ITMLKit -[IKAppContext _doEvaluate:] (ITMLKit) ITMLKit -[IKAppContext _evaluate:] (ITMLKit) ITMLKit __41-[IKAppContext evaluate:completionBlock:]_block_invoke (ITMLKit) ITMLKit -[IKAppContext _sourcePerform] (ITMLKit) ITMLKit -[IKConcurrentEvaluator lockSchedulingForEvaluation:] (ITMLKit) ITMLKit IKRunLoopSourcePerformCallBack (ITMLKit) CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (CoreFoundation) CoreFoundation __CFRunLoopDoSource0 (CoreFoundation) CoreFoundation __CFRunLoopDoSources0 (CoreFoundation) CoreFoundation __CFRunLoopRun (CoreFoundation) CoreFoundation CFRunLoopRunSpecific (CoreFoundation) ITMLKit -[IKAppContext _jsThreadMain] (ITMLKit) Foundation __NSThread__start__ (Foundation) libsyste...ad.dylib _pthread_start (libsystem_pthread.dylib) libsyste...ad.dylib thread_start (libsystem_pthread.dylib) This issue seems very similar to this existing thread, although not sure its related

We're having trouble connecting to local area network websockets in Safari in the latest iOS26 Beta 3 (iPhone 14), both secure and unsecure. Code works < iOS26 & macOS, etc. -- Unsecure behaviour: need to call connectWebSocket() twice, establishes connection reliably. Calling connectWebSocket() once, will sometimes work, sometimes not. -- Secure behaviour: Error in debug console, even though the certificate has been accepted and the page is loaded as https. Error: WebSocket connection to 'wss://192.168.1.81/api/webSocket' failed: The certificate for this server is invalid. You might be connecting to a server that is pretending to be “192.168.1.81”, which could put your confidential information at risk. -- let apiEndpoint = window.location.hostname; if (apiEndpoint == null || apiEndpoint == '') { apiEndpoint = "192.168.1.81"; } function connectWebSocket() { if (webSocket && webSocket.readyState == 1) { return; } if (webSocket) { webSocket.close(); } webSocket = new WebSocket( (window.location.protocol === 'https:' ? "wss://" : "ws://") + apiEndpoint + "/api/webSocket", ); webSocket.onerror = (error) => { console.log("WebSocket error", error); }; webSocket.onopen = () => { console.log("WebSocket connected"); webSocket.send("volume"); webSocket.send("isPlaying"); }; webSocket.onmessage = (event) => { const msg = event.data; if (!msg) return; if (msg.startsWith("volume")) { const volume = parseInt(msg.replace('volume:','')); const slider = document.getElementById("volumeSlider"); slider.value = volume; slider.style.background = `linear-gradient(to right, #007bff ${volume}%, white ${volume}%)`; } else if (msg.startsWith("isPlaying")) { const url = msg.replace('isPlaying:', ''); let matchedEntry = null; let coverToSelect = null; categories.forEach((category, catIdx) => { category.entries.forEach((entry, entryIdx) => { if (entry.url === url) { matchedEntry = entry; coverToSelect = document.querySelector(`.cover[category-idx="${catIdx}"][entry-idx="${entryIdx}"]`); } }); }); if (matchedEntry && coverToSelect) { selectCover(coverToSelect, true); showNowPlayingBar(matchedEntry); const top = coverToSelect.getBoundingClientRect().top + window.scrollY - 150; window.scrollTo({ top, behavior: 'smooth' }); } } }; webSocket.onclose = () => { console.log("WebSocket closed, retrying..."); setTimeout(connectWebSocket, 1000); }; } document.addEventListener("visibilitychange", () => { if (document.visibilityState === "visible") { connectWebSocket(); } }); connectWebSocket();

Hi, I’m trying to detect whether my Safari Web Extension is running in Safari or Safari Technology Preview. Is there a reliable way to do that? I can get the executable path of the parent process using proc_pidpath(). However, unlike Chrome or Firefox, Safari extensions run under /sbin/launchd as the parent process, not the responsible process (browser’s binary). In this scenario, I need the executable path of the actual browser process, but I haven’t found a way to get it. Also, Safari doesn’t implement the Web Extension API’s browser.runtime.getBrowserInfo(), unlike Firefox. I haven’t tested it yet, but I’m considering checking the user agent string, though I’m not sure how reliable that would be. Use Case Some users use my Safari extension as a web development tool and want to enable some features exclusively in Safari Technology Preview, while using other features only in standard Safari. If I could detect which browser is in use, I could provide the appropriate functionality for them.

Hi, My app is using JavascriptCore to run the business logic in a javascript environment. We are randomly seeing crashes when users move the app back to the foreground. These crashes are reported by Firebase (I am attaching an example). I also tried to find them in Organizer, but the stacktraces don't match and I am not sure if they are pointing to the same error (I attach one just in case). I was trying to investigate a little bit about this, but I could find any explanation about what pas_reallocation_did_fail would mean. Here is our implementation: -(void) enqueueCallback:(JSValue *)callback withArguments:(NSArray *)args exclusive:(BOOL)exclusive { [self enqueueBlock:^{ @autoreleasepool { [callback callWithArguments:args]; } } exclusive:exclusive]; } Basically, every JS block is enqueued and then run by a dedicated thread specific to our JSContext. Can I get some help? Thanks in advance! Crashlytics.txt 2024-08-30_10-00-01.2572_-0400-f757f8306eda9679ec1b2ff90fbc66c4eb1fbee7.crash

Is the new Observations API for WebPage not available in Beta 1 as demoed in the WWDC video? I get this error even though Observation is imported.

Hi Apple Devs & WebKit Team, We operate https://excnum.com — a personal website currently under reconstruction. It's HTTPS-secure, hosted on a clean VPS, and now features a simple placeholder page with no active forms, scripts, or external redirects. However, Safari on both iOS and macOS is flagging it as a “deceptive website”, blocking all access. This warning appears even though: The site uses a valid SSL certificate via Cloudflare There are no redirects, tracking scripts, or dynamic code We serve a static landing page (“under maintenance”) with zero interaction No malware, phishing, or obfuscation exists — verified with multiple tools A review request has already been submitted at: https://websitereview.apple.com We believe the site may have been blacklisted previously under past ownership or prior configurations. It has since been completely restructured and cleared, but the Safari warning persists. This false flag is harming visibility and trust for an otherwise neutral website. Any advice on how to expedite re-evaluation or request a manual delisting from the deceptive site list would be much appreciated. Thank you! — Alex Admin, EXCNUM.COM

Issue Description I'm developing a hybrid iOS app and encountering WebView bridge communication issues after updating to Xcode 16 with iOS 18 SDK. App Architecture AViewController: Initial view controller displayed at app launch Handles WebView setup and web-to-native bridge communication Pushes BViewController when receiving "B" bridge message from web BViewController: View controller stacked on top of AViewController Managed by navigation controller AViewController's WebView continues bridge communication even when BViewController is active Problem Behavior Xcode 15 (iOS 18): WebView bridge communication in AViewController works normally while BViewController is active Xcode 16 (iOS 18 SDK): Server communication breaks or hangs without response while BViewController is active Communication resumes only after popping back to AViewController from BViewController Questions Is the current architecture (configuring WebView in AViewController and maintaining bridge communication through AViewController's WebView while BViewController is presented) not a recommended pattern? Is Xcode 16's iOS 18 SDK the cause of this issue? If so, could you help me understand which specific changes are affecting this behavior? This is urgent as we need to deploy soon. I would greatly appreciate a prompt response.

I'd like to know the install state of my iOS safari extension in the associated swift app. Is there any way to get this? As we have seen it is available for macOS here, is there anyway to know iOS Safari extension is enabled or not? Thanks

I am testing stuff on a website, and it worked well on any mobile browser till iOS18. Now that I am testing iOS26, even with the latest BETA (3) everything works smoothly on any other mobile browser but Safari. Previously I had the bug, which now has been patched, for status-bar, which was flickering too, but popover and page issue seems still there. I have persistent popover and ajax navigation, and both are rendering with bugs and fouc while view/page changes. Example: If I have an element which must stay on its place and its width is 100vw: while page changes it blinks, shrinks, flicker and jumps on rendering, while it simply must stay as is.. Animations and page transitions work smoothly on Chrome mobile (latest iOS 26 beta 3) , while breaking on Safari. I did open a feedback FB18328720, but seems no one caring. Any idea guys? ** Video of the bug (which is huge!) : ** https://youtube.com/shorts/rY3oxUwDd7w?feature=share Cheers

Hi everyone, I’m encountering a serious reliability issue with message passing in my Safari extension on iOS 18.4.1 and iOS 18.5 In my extension, I use the standard messaging API where the background script sends a message to the content scrip. The content script is listening using: browser.runtime.onMessage.addListener(handler); This setup has been working reliably in previous versions of iOS, but since updating to iOS 18.4.1 and iOS 18.5, I’ve noticed that messages sent from the background script are not consistently received by the content script. From my logs, I can confirm that: The background script is sending the message. The content script’s listener is not always triggered. There are no errors or exceptions logged in either script. It seems as if browser.runtime.onMessage.addListener is either not getting registered in time or failing silently in some instances. This issue is intermittent and does not occur all the time. Has anyone else experienced similar issues in iOS 18.4.1 and 18.5? Are there any known changes or workarounds for ensuring reliable communication between background and content scripts in this version? Any help or insights would be greatly appreciated. Thanks!