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Safari browser compatibility issue
I have a local HTML file used to display mixed content with images and text. Here's the issue: the same file displays everything correctly in Google Chrome, showing both images and text as expected. However, when opened in Safari, only the text is shown—images are missing, which is very strange. Interestingly, if I remove .png from the title attribute of the tag, the images show up properly in Safari. Alternatively, if I comment out the inclusion of html2canvas.min.js, the images also display correctly (although the layout breaks without it). I'm not sure if this is a Safari-specific issue. Can anyone explain what might be causing this problem?
Topic: Safari & Web SubTopic: General
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Mar ’25
The bottom tab bar appears after using the keypad in OS26.
hi Testing on OS26 Public Beta 6. In Safari, if you enter x homepage and scroll, the tab bar sticks to the bottom and moves. Make the keyboard appear in the search window When scrolling down on the Safari homepage again, the issue of not being able to stick to the bottom appears. Is it because the liquid glass UI was applied this time? and safari bug? Please let me know if I'm missing anything
Topic: Safari & Web SubTopic: General
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1.6k
Sep ’25
[iOS 26.2] Crash due to WKScriptMessageHandler delegate
The crash is specific to iOS 26.2 prior versions working fine. WKScriptMessageHandler delegate func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) Name attribute is accessible but WKScriptMessage body attribute causes crash The object seems to be not accessible(not in memory) self.webkit.configuration.userContentController.add(self, name: "sampleHandler") self.webkit.load(request) func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) { print(message.name) // works print(message.body) // crashes }
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1.6k
4w
Unable to Override "Link with Highlight" in WKWebView
Hello everyone, I'm working on an app that uses WKWebView. My app uses a custom menu and we disable the default menu by overriding with: WKWebAction.canPerformAction() However, with the new iOS 18.2 release, I am no longer able to override the "Copy Link with Highlight" option that pops up when highlighting a selection as can be seen from the screenshot: Has anyone found a work around/bypass for this? Environment iOS Version: iOS 18.2 Device: iPhone 13 Pro App platform: iOS Xcode version: 16.1 MacOS: 14.5
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1.3k
Sep ’25
PRF Extension Not Supported in Safari's Cross-Device WebAuthn Flow
Safari 18.0.1 on macOS 15.01 doesn't support the Passkey PRF extension during cross-device WebAuthn authentication when using QR code scanning, while it works correctly with iCloud passkeys. Steps to Reproduce: Clone and setup: git clone https://github.com/quocle108/passkey-prf-test yarn yarn start Test iCloud Passkey Flow: Open http://localhost:3000 in Safari Open DevTools (Cmd+Option+I) Click "Register" Choose "Passkey on iCloud" Expected console output: PRF supported: true Test Cross-Device Flow: Click "Register" Choose "Phone/Tablet" Scan QR with mobile device Expected: PRF supported: true PRF extension should be supported in cross-device flow, matching iCloud passkey behavior. Actual: PRF supported: false Cross-device flow returns empty extension results. Verify in Chrome Repeat steps 2-3 in Chrome Both flows return proper PRF extension results: PRF supported: true Test Environment: Browser: Safari 18.1.1 , Chrome 131.0.6778.70 OS: macOS 15.01 Mobile: iOS 18.x / Galaxy Note9 Android 10 Test repo: https://github.com/quocle108/passkey-prf-test
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Mar ’25
invalid_client : Apple sign in web
I am trying to setup web sign in with apple, I have an active apple subscription and have set up all necessary things. I made a service id in apple Identifiers, connected to existing primary id (also has apple sign in enabled). I have my domain set up also correctly but still I cant generate the code due to invalid client. What do I need to do? I have also tried recreating the service ids multiple times with no luck. my init is AppleID.auth.init({ clientId : '[CLIENT_ID]',//used the service id one not app id redirectURI : '[REDIRECT_URI]', usePopup : true }); link to generate codes now is: https://appleid.apple.com/auth/authorize?client_id=com.crmtournest.sigin&redirect_uri=https%3A%2F%2Fwww.tournestcrm.com%2Fauth%2Fcallback&response_type=code%20id_token&state=saciy7rn1km&scope=name%20email&response_mode=web_message&frame_id=03487c22-abb4-48cd-8613-d6bf5836e9eb&m=11&v=1.5.5 Also tried: https://appleid.apple.com/auth/authorize?client_id=com.crmtournest.sigin&redirect_uri=https%3A%2F%2Fwww.tournestcrm.com%2Fauth%2Fcallback&response_type=code%20id_token (not working) I get invalid_client setup on apple below:
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Jun ’25
App’s navigation bar items change background color unexpectedly
iPadOS 26, dark mode Open Safari Search for anything or open a website that has white background Kill Safari Open Safari again I still can reproduce it with Safari on iPadOS 26.0.1 This issue also happens to my app when opening a HTML/JS on WKWebView with white background while using dark mode. I did send a feedback ticket when using iPadOS 26 beta but havent seen any reply. This is my first time sending a feedback so I dont know if Apple would reply or not.
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Oct ’25
Enabling Picture-in-Picture (PiP) in WKWebView
I'm working on a web browser App that's distributed via the App Store. This app renders web pages using WKWebView. Our users are requesting a way for us to allow them to play videos in Picture in Picture. After some investigation, we noticed that in order to allow PiP videos in our browser in the sandboxed environment, we need to add the com.apple.PIPAgent entitlement under the com.apple.security.temporary-exception.mach-lookup.global-name option. We tried to submit our app with this entitlement, but unfortunately, we were rejected: Guideline 2.4.50) - Performance We've determined that one or more temporary entitlement exceptions requested for this app are not appropriate and will not be granted: com.apple.security.temporary-exception.mach-lookup.global-name com.apple.P|PAgent We would like to have access to this entitlement so we can offer PiP to our users. We already created a radar about this as well: FB13814428 Additionally, we have another radar (FB13557716) regarding allowing the usage of a private flag _allowsPictureInPictureMediaPlayback, which would also be required to enable us to use PiP. Is there any way in which we can currently enable PiP? Would opening a TSI help here?
Topic: Safari & Web SubTopic: General Tags:
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1.4k
Jan ’26
Incorrect website rendering under iOS 26.2
Starting with iOS 26.2, when Safari tabs are set to Bottom or Compact view, some pages are not rendering properly. The error does not occur in Top view. For some pages, scrolling causes rendering to be very slow, causing the user to experience page breaks and missing parts. If the user waits a few seconds, the missing parts of the page will appear, but the issue will reoccur when scrolling further. We have tested this on all available iOS devices and the issue occurs on all iPhones running iOS 26.2. The issue does not occur on iOS 26.1, and we have not experienced it on devices running iOS 18. The issue can be reproduced on the following pages with an iPhone running iOS 26.2: https://fotosakademia.hu/products/course/fotografia-kozephaladoknak-haladoknak https://oktatas.kurzusguru.hu/products/course/az-online-kurzuskeszites-alapjai
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Jan ’26
WebAuthn
The passkey authentication dialog appears, and after unlocking with Touch ID, the dialog closes without any notification of success or failure. This issue occurs with high frequency. access to the https://passkeys-demo.appspot.com/ register account and create passkey. logoff access to the url again you can see the passkey dialog unlock device then the dialog disappears nothing happens reload the page proceed 5) to 6) nothing happens or success webauthn.
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Jan ’26
Preventing JavaScript from Stopping in Safari When It Goes into the Background
From a mail app or similar, when opening a webpage in Safari as an external browser, JavaScript on the webpage stops running if Safari goes into the background. Is there a way to prevent this from happening? Sample code for the counter: Behavior: Upon returning from the background, the counter continues for about 7-8 seconds but does not progress further. For example, if Safari is kept in the background for about 20 seconds and then brought back, the counter stops at around 7-8 seconds and only resumes counting after returning to the foreground. Expectation: The counter should continue running even if Safari goes into the background.
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Mar ’25
JavaScriptCore crashed in iOS 17 and iOS 18
Hello, my application experiences crashes related to JavaScriptCore in iOS 17 and 18. I would like to consult about potential causes, to determine whether it is a bug in JavaScriptCore or an issue with my code implementation. First, the crash stack always includes the call to JSC::MarkedBlock::aboutToMarkSlow(unsigned int). In the iOS 17 version, the crash occurs on this line, typically JSC::MarkedBlock::aboutToMarkSlow(unsigned int) + 88. In iOS 18 and later, the stack crashes atJSC::MarkedBlock::dumpInfoAndCrashForInvalidHandle(WTF::AbstractLocker&, JSC::HeapCell*). I checked the source code of JavaScriptCore for both iOS 17.6 and iOS 18.2 and observed modifications in the implementation of aboutToMarkSlow. My question is under what circumstances could this crash occur? crash.log I have attached a crash log encountered in iOS 18, hoping you can provide more effective information for problem diagnosis, especially since there are specific details worth noting near the crash registers. INVALID HANDLE: MarkedBlock = 0x141158000; heapCell = 0x14115bfa0; type = 0 INVALID HANDLE: found 24 0s at beginning of block INVALID HANDLE: block in another VM: 1, block in another VM: 1; other VM is 0x1324b6000 Moreover, in iOS 18.4, due to the implementation of dumpInfoAndCrashForInvalidHandleV2, the message has changed to: INVALID HANDLE 587: markedBlock=0x303518000; heapCell=0x303518fe0; cellFirst8Bytes=0; subspaceHash=0; contiguousZeros=0; totalzeros=0; blockVM=0x0; actualVM=0x0; isBlockVMValid=0; isBlockInSet=0; isBlockInDir=0; foundInBlockVM=0; INVALID HANDLE 606: markedBlock=0x303518000; heapCell=0x303518fe0; cellFirst8Bytes=0; subspaceHash=0; contiguousZeros=16384; totalZeros=16384; blockVM=0x0; actualVM=0x0; isBlockVMValid=0; isBlockInSet=0; isBlockInDir=0; foundInBlockVM=0; INVALID HANDLE 615: markedBlock=0x303518000; heapCell=0x303518fe0; cellFirst8Bytes=0; subspaceHash=0; contiguousZeros=16384; totalZeros=16384; blockVM=0x0; actualVM=0x0; isBlockVMValid=0; isBlockInSet=1; isBlockInDir=1; foundInBlockVM=0; (Further INVALID HANDLE messages follow the same format) I hope this provides you with more information.
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Mar ’25
WebView Loading Issue iOS 18.1
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.
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3.8k
Jul ’25
safari web extension 在进行direct distribution分发时 在safari setting 中显示“没有权限读取、修改或传输任何网页的内容”
使用direct distribution进行分发时,safari web extension 在safari setting 中显示没有权限读取、修改或传输任何网页的内容。 但是我在看公证日志显示插件是正常的公证的 这导致safari extension 无法使用。 公证日志 https://www.coupert.com/img/2025-04-10/notarization-log.json
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Apr ’25
iOS 26.1 beta Safari audio input is broken
I'm a web developer of WebRTC based web app for video and audio calls. After updating to iOS 26.1 beta I noticed, that my app can't use microphone anymore. When I'm calling to getUserMedia with audio set to true, Safari returns error "No AVAudioSessionCaptureDevice device". Other WebRTC demo apps also can't access microphone on this firmware. And maybe it's connected somehow, but safari can't detect connected AirPods Pro 2 as an input device. So, this bug brakes any WebRTC app, that uses microphones.
Topic: Safari & Web SubTopic: General Tags:
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Oct ’25
What is the recommended way to programmatically apply proxy to WKWebView
Hi Apple engineers! We are making an iOS browser and are planing to deliver a feature that allows enterprise customers to use a MAM key to set a PAC file for proxy. It's designed to support unmanaged device so the MDM based solutions like 'Global HTTP Proxy MDM payload' or 'Per-App VPN' simply don't work. After doing some research we found that with WKWebView, the only framework allowed on iOS for web browsing, there's no API for programmatically setting proxy. The closes API is the WKURLSchemeHandler, but it's for data management not network request interception, in other word it can not be used to handle HTTP/HTTPS request well. When we go from the web-view level to the app level, it seems there's no API to let an app set proxy for itself at an app-level, the closest API is Per-App VPN but as mentioned above, Per-App VPN is only available for managed device so we can't use that as well. Eventually we go to the system level, and try to use Network Extension, but there's still obstacles. It seems Network Extension doesn't directly provide a way to write system proxy. In order to archive that, we may have to use Packet Tunnel Provider in destination IP mode and create a local VPN server to loop back the network traffic and do the proxy stuff in that server. In other word, the custom VPN protocol is 'forward directly without encryption'. This approach looks viable as we see some of the network analysis tools use this approach, but still I'd like to ask is this against App Store Review Guidelines? If the above approach with Network Extension is not against App Store Review Guidelines, I have a further question that, what is the NEProxySettings of NETunnelNetworkSettings for? Is it the proxy which proxies the VPN traffic (in order to hide source IP from VPN provider) or it is the proxy to use after network traffic goes into the virtual private network? If none of the above is considered recommended, what is the recommended way to programmatically set proxy on WKWebView on an unmanaged device (regardless of where the proxy runs, web-view/app/system)?
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1.8k
Jan ’26