Explore the integration of web technologies within your app. Discuss building web-based apps, leveraging Safari functionalities, and integrating with web services.

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JavascriptCore and event loop / timers
JavascriptCore doesn't come with any support for setTimeout (which is an API on the window/DOM object not provide din JavaScriptCore). So you need to implement a version of this yourself - no worries on that (there are examples to refer to out there, so it is fairly easy to set this up). But I have come across an issue with this that I am not sure how to handle properly. It relates to when the timer callback fires and runs code in the JavaScript engine itself. Consider this code snippet (assume I have provided an implementation of setTimeout): console.log('Hello - here we go'); setTimeout(() => { console.log('Hi from setTimeout callback ...'); }, 0); Promise.resolve().then(() => { console.log('Hi from promise'); }); console.log('Hi from main block'); In Node.js or say Safari, I would see this output: Hello - here we go Hi from main block Hi from promise Hi from setTimeout callback ... So the promise then() is handled before the settimeout callback is handled. I think this is basically because Promise then() handlers are pushed onto something like a microtask queue, and the setttimeout callbacks on a separate queue, and the microtask queue is emptied before any other queue is processed (after completing the current event loop of course). But when I implement this in JavaScript core, I don't always see the above - instead I can have: Hello - here we go Hi from main block Hi from setTimeout callback ... Hi from promise So the timeout callback can be run BEFORE the promise handler. This obviously is different from Node or Safari. Now I assume that is because the timeout callback is triggered from Swift native code that uses the call() API on a JSValue object that is provided when the settimeout is given to the native layer to process. And it seems that when native code attempts to execute JavaScript code (via call() or similar) then this is just executed as soon as possible - obviously not interrupting the Javascript core when executing any current event loop code, but potentially running between the point when the Javascript core finishes a normal event loop cycle and then starts processing the queued promise handlers. This means that code that runs nicely in Node (for example) might not work the same way due to this behaviour. Also, I also notice another thing: if JavaScript code makes a call to a native-provided method (e.g. by calling the setTimeout I show above, which I implement via a native-side handler) then during that call from JavaScript, it is possible for the native side to execute a call() and run Javascript code it wants. Again this is not what would happen in Node or Safari: it is not possible for timeouts (or network completions) to interrupt any 'builtin' function call, but in JavascriptCore it certainly is (to get around this I set a flag on the JavaScript side indicating a native call is being made, and if any native-triggered callback occurs on the javascript side when this flag is set, I have to 'queue' it via a promise handler for execution AFTER the current event loop is complete). Are these known issues with Javascript core and are there ways to get around them? thanks
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Issue with WebM Video Transparency Rendering on ios app
I'm experiencing a persistent issue with transparent WebM videos rendered via WKWebView in an iOS Capacitor app. The videos display a black background frame, which does not occur in the web version of the app. I've tried: Enabling experimental WKWebView features. Adjusting meta tags for inline video playback and hardware acceleration. That's my code: <Carousel showThumbs={false} showStatus={false} showIndicators={true} showArrows={false} infiniteLoop={true} autoPlay={true} interval={5000} // Change slide every 5 seconds onChange={(index) => { if (playerRefs.current[index]) { playerRefs.current[index]?.seekTo(0); playerRefs.current[index]?.getInternalPlayer()?.play(); } }} > {videos.map((video, index) => ( <div key={index} className="video-slide"> <ReactPlayer ref={(player) => (playerRefs.current[index] = player)} url={video.src} playing={isLoaded[index]} // Play only when video is loaded loop muted width="100%" onReady={() => handleVideoReady(index)} // Set loaded state when video is ready style={{ backgroundColor: 'transparent' }} config={{ file: { attributes: { playsInline: true, }, }, }} /> <p className="description">{video.description}</p> </div> ))} </Carousel> It is not occur in the web version of the app (testing with xCode).
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iOS WKWebview - When we run the WKWebview with loading the HTML( file. It contain. Getting this method call webViewWebContentProcessDidTerminate(_ webView: WKWebView). Can anyone provide the
iOS WKWebview - When we run the WKWebview with loading the HTML file. Including JS method call and video looping it here in js file. Getting this method call webViewWebContentProcessDidTerminate(_ webView: WKWebView). Can anyone provide the solution? Thanks
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Oct ’24
Is the Apple aware that Safari does not follow the Gamepad API spec?
The specification states that the timestamp property is a DOMHighResTimeStamp which always represents a value in milliseconds. However, in my testing (on iOS as I don't have a mac) the timestamp is given as seconds. This could break compatibility if an app/library is not tested in Safari. Worse is that the deviation seems to be undocumented as every compatibility chart states full compatibility and defines the property as milliseconds. Any workaround would also be up to one frame incorrect. So a stutter can affect input accuracy. I know this might seem small but it could mean that an app or game is unplayable in Safari if it relies on this for input.
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JavaScriptCore Crashed in iOS17 and above system
After the release of iOS17, our app has collected JavaScriptCore crashes, and the crash has recently appeared in iOS17 and above. The number of crashes collected recently is increasing. The following are several complete crash log information. Currently, crashes are only collected on iOS17 and above systems. 2024-05-08_20-45-00.5216_+0800-fdb980f66f56d73b944ccc3466922d7fd0690089.crash 2024-05-11_02-42-46.0303_+0800-5ea1f23ba38c4782b80bd6304a9625e305c296a2.crash 2024-05-13_14-30-03.2084_+0800-d9598b08a153f5214b51257400423d4079049578.crash
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Sep ’24
safari push notification endpoint always empty
Hi, I implemented push notifications on my PWA, and it work fine with all browsers except with Safari. I followed all the recommendations given by Brady Eidson in this video : Meet Web Push for Safari And the result is that all the push notification process work fine with others browsers, from the subscription to the notification delivery and display. But with Safari the endpoint is always empty and I do not understand why. No error is triggered during subscription. Just the result is a subscription with an empty endpoint. I have the same result on iPad, iPhone and iMac. Everything is working well with others browsers or with android smartphone. But contrary to what Brady Eidson promised in his video, it does not work with Safari.
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webpush
hi anybody can help me with webpush fcm? after some hours and pwa closed the webpush notification doesn't arrive until i re-open webapp and recreate a new token
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safari push notification endpoint always empty
Hi, I implemented push notifications on my PWA, and it work fine with all browsers except with Safari. I followed all the recommendations given by Brady Eidson in this video : Meet Web Push for Safari And the result is that all the push notification process work fine with others browsers, from the subscription to the notification delivery and display. But with Safari the endpoint is always empty and I do not understand why. No error is triggered during subscription. Just the result is a subscription with an empty endpoint. I have the same result on iPad, iPhone and iMac. Everything is working well with others browsers or with android smartphone. But contrary to what Brady Eidson promised in his video, it does not work with Safari.
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Overlay appears in fullscreen mode in Safari when video is paused - how to prevent this via JavaScript
When a video in Safari is played in fullscreen mode and the user pauses it, an overlay (such as a play button or other controls) appears. This affects the user experience, as we want to avoid showing the overlay during fullscreen viewing after the video is paused. Expected Behavior: The overlay should not appear after the video is paused in fullscreen mode. Steps to Reproduce: Open a webpage https://slides-dev.pitchavatar.com/rtxuf in Safari. Start playing the video. Enter fullscreen mode. Pause the video. The overlay appears after the video is paused. Screenshot: Additional Information: Safari version: Safari 18.0.1 (20619.1.26.31.7) Environment: macOS Sequoia 15.0.1 (24A348) We would like to know if there is there any way to prevent the overlay from appearing in Safari when the video is paused in fullscreen mode.
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Crashing in WKWebview Often, when the video is loaded in the webview using an HTML file
Hello, Team. We used WKWebView for our project. We loaded the HTML file into the webview and added the following configuration. weak var webView: WKWebView! func configWebView() { let webViewConfig = WKWebViewConfiguration() let controller = WKUserContentController() controller.add(self, name: "sometest") webViewConfig.userContentController = controller webViewConfig.processPool = WKProcessPool() webViewConfig.setValue(true, forKey: "allowUniversalAccessFromFileURLs") webViewConfig.mediaTypesRequiringUserActionForPlayback = [] let webpagePreferences = WKWebpagePreferences() webpagePreferences.allowsContentJavaScript = true webViewConfig.defaultWebpagePreferences = webpagePreferences webViewConfig.websiteDataStore = WKWebsiteDataStore.default() webView = WKWebView(frame: .zero, configuration: webViewConfig) webView.navigationDelegate = self webView.uiDelegate = self webView.translatesAutoresizingMaskIntoConstraints = false view.addSubview(webView) NSLayoutConstraint.activate([ webView.topAnchor.constraint(equalTo: view.topAnchor), webView.bottomAnchor.constraint(equalTo: view.bottomAnchor), webView.leadingAnchor.constraint(equalTo: view.leadingAnchor), webView.trailingAnchor.constraint(equalTo: view.trailingAnchor) ]) loadWebView() } func loadWebView() { guard let documentsDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return } let contentFolderURL = documentsDirectoryURL.appendingPathComponent("content") let assetFolderURL = contentFolderURL.appendingPathComponent(interactiveGUID) if FileManager.default.fileExists(atPath: assetFolderURL.path) { let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first! let documentsURL = URL(fileURLWithPath: documentsPath) let fileToLoadPath = (documentsPath as NSString).appendingPathComponent("content/index_p.html") let fileURL = URL(fileURLWithPath: fileToLoadPath) autoreleasepool { DispatchQueue.main.async { [weak self] in guard let self = self else { return } self.webView.loadFileURL(fileURL, allowingReadAccessTo: documentsURL) } } } We are experiencing webview crashes when loading an HTML file. What happened when I loaded the video file? It automatically looped. Webview frequently crashes when the HTM/JS file is loaded. When a webview crashes, the delegate method usually calls webViewWebContentProcessDidTerminate. This method calls webview.reload(). Also we are clear and cache/ deallocate eveything when i initialized those configuration mentioned as the above. Can you suggest a solution to this? Why is webview crashing? Thank you.
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HTML input onChange Event Triggered Multiple Times with Korean Multilingual Keyboard in iOS 18
Description: When using a multilingual keyboard that includes Korean in iOS 18, the input element's onChange event is triggered multiple times instead of just once. This issue occurs not only when entering numbers with input type="tel" or inputMode="numeric", but also when entering text with input type="text". This causes unexpected behavior in forms and other input-related functionalities. Affected Devices and OS Version: Device: iPhone 16 Pro OS Version: iOS 18.0 You can reproduce the issue with this CodeSandbox example: https://codesandbox.io/p/sandbox/elegant-dream-jnqh39 Steps to reproduce: Use a multilingual keyboard (e.g., Korean and English) on iOS 18. Type some text into the input field (input type="text"). Also try entering numbers using input type="tel" or inputMode="numeric". Observe that the onChange event is fired multiple times for both text and numeric input. Expected behavior: The onChange event should only be triggered once when text or numeric input changes. Additional Information: This issue has been reported under feedback ID FB15377631. Currently waiting for a response from Apple regarding this feedback.
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关于 Ipad 18 在 Safari 浏览器的 PUT 请求问题
正常情况下,浏览器执行PUT请求会返回上传进度 在Safari 浏览器上,Ipad 16,Ipad 17 均正常,Ipad 18 上传进度返回一直不变 ipad版本兼容性问题 ipad (16+Safari):动作正常(逐步显示上传进度) ipad (17+Safari):动作正常(逐步显示上传进度) ipad (18+Safari):动作不正常(显示1%直到完成)
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iOS18 Safari: Page content loses focus after switching to a new tab with chrome.tabs.update
Hi, I have a Safari extension that works well in iOS before 18, which can switch to a different tab with chrome.tabs.update back and forth by keyboard shortcuts. With iOS 18, as Page content loses its focus, it is impossible to trigger content script directly, I have to manually touch screen to put focus back to page content so that keystroke can trigger my content script to talk with background to call chrome.tabs.update to switch back. Please bring focus to page content after switching to a new tab with chrome.tabs.update.
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Adding a Safari Extension to Capacitor iOS App as an Application Extension
Hello everyone, I’m working on adding a Safari extension as an application extension to an iOS app created using Capacitor (generated from a React app). My goal is to bundle the Safari extension within the Capacitor app, allowing it to serve as a companion app for the extension. However, I’ve run into issues where the extension does not show up in Safari's extension settings when I run the app on a device or simulator. Here's an overview of what I’ve done so far: I initially used Capacitor’s command line tools to generate the iOS app from my React project. This app runs fine on its own. To add the Safari extension, I’m not developing a platform-specific extension from scratch; instead, I used the Xcode command line to convert a Chrome extension to a Safari iOS extension. The converted extension functions correctly if paired with the default Swift app that comes with the conversion. Right now, I effectively have two products: The base Capacitor app (without the extension), which I want as my main app. The standalone Safari extension bundled with the Swift app (from the conversion process). My question is: How can I merge these two products so that the Capacitor app becomes the companion app for the Safari extension, allowing the extension to show up in Safari's settings? Are there specific configurations I should adjust in Xcode or within the manifest files to make this work seamlessly? Any guidance or best practices from others who have integrated Safari extensions into non-Xcode-based projects would be much appreciated! Thank you!
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RTCPeerConnection is undefined on page loaded in Mac WKwebview
Hello I have a webrtc-based web app that is loaded inside a WKWebView. The web app gets loaded just fine in our iOS App running WKWebView on an iPad with iOS 15.1. We are using the exact same app, built for Mac Catalyst. However, on the Mac version, the web app gets loaded but the RTCPeerConnection object is undefined.. Meaning that our web app assumes that WebRTC is not available in that browser. Isn't the native app supposed to work the exact same on iOS and MacOS? Is the Mac version of WKWebView more limited than its iOS counterpart ? Is there any resource that states exactly what is supported in WKWebview in each platform? Thanks
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Dec ’21