321330 2026-08-07 14:43:43 -0700 [iOS] Pinching native video controls requests fullscreen repeatedly 2026-10-15 03:31:11 -0700 1 1 1 Unclassified WebKit Media Safari 26 iPhone / iPad iOS 26 NEW InRadar P2 Normal --- 206854 1 ingram.kalina webkit-unassigned fred.wang webkit-bug-importer oldest_to_newest 2238465 0 ingram.kalina 2026-08-07 14:43:43 -0700 Steps to reproduce: 1. On iPhone, load a page containing an inline <video controls playsinline controlslist="nofullscreen"> element. 2. Place two fingers over the native controls and pinch outward past the threshold that enters fullscreen. Observed behavior: The native media controls request fullscreen repeatedly while the same pinch continues. The first request starts the fullscreen transition, while subsequent requests reach HTMLVideoElement.webkitEnterFullscreen() during the transition and raise InvalidStateError: The object is in an invalid state. Expected behavior: The native media controls should request fullscreen once per pinch gesture. The issue is in IOSInlineMediaControls._pinchGestureRecognizerStateDidChange(). Once recognizer.scale exceeds MinimumScaleToEnterFullscreen, the method invokes iOSInlineMediaControlsRecognizedPinchInGesture() for every Changed state and again for the terminal Recognized/Ended state. MediaController then calls webkitEnterFullscreen() for each invocation. Reproduced with a real two-finger gesture in the iOS 26.5 simulator. The same repeated requests occur when controlslist="nofullscreen" is removed, so controlslist is part of the original reproduction but is not the cause. The behavior is also independent of playback state and playsinline. 2238473 1 ingram.kalina 2026-08-07 14:55:59 -0700 Pull request: https://github.com/WebKit/WebKit/pull/71185 2240453 2 webkit-bug-importer 2026-08-14 14:44:11 -0700 <rdar://problem/184952141> 2264342 3 481836 fred.wang 2026-10-15 02:28:05 -0700 Created attachment 481836 testcase 2264345 4 fred.wang 2026-10-15 02:37:57 -0700 I uploaded a tentative testcase, but I'm not sure how to emulate the pinch in Device Hub without a trackpad. 2264359 5 ingram.kalina 2026-10-15 03:28:28 -0700 The layout test in PR 71185 lets you check the repeated fullscreen-request callback without emulating a pinch in Device Hub. The test is: LayoutTests/media/modern-media-controls/ios-inline-media-controls/ios-inline-media-controls-pinch-enters-fullscreen-once.html With the test and its expected-results file from the PR in your checkout, run from the repository root: Tools/Scripts/run-webkit-tests --ios-simulator media/modern-media-controls/ios-inline-media-controls/ios-inline-media-controls-pinch-enters-fullscreen-once.html It drives the recognizer through Began, Changed, Changed, Ended, then starts a second gesture. The cumulative delegate-call counts are: Unpatched Patched First Changed 1 1 Second Changed 2 1 Ended 3 1 Changed in a new gesture 4 2 This isolates the duplicate-request behavior; it doesn't exercise the actual fullscreen transition. My end-to-end reproduction used XCUITest on the iOS 26.5 simulator. A window error listener displayed repeated “InvalidStateError: The object is in an invalid state.” messages on the diagnostic page. I haven't run your attachment yet. Entering fullscreen itself is expected—the bug is the repeated requests within one gesture. 2264360 6 ingram.kalina 2026-10-15 03:31:11 -0700 For clarity, the counts above are unpatched → patched: - First Changed: 1 → 1 - Second Changed: 2 → 1 - Ended: 3 → 1 - Changed in a new gesture: 4 → 2 481836 2026-10-15 02:28:05 -0700 2026-10-15 02:28:05 -0700 testcase 321330.html text/html 255 fred.wang PCFET0NUWVBFIGh0bWw+CjxtZXRhIGNoYXJzZXQ9InV0Zi04Ii8+CjxtZXRhIG5hbWU9InZpZXdw b3J0IiBjb250ZW50PSJ3aWR0aD1kZXZpY2Utd2lkdGgiIC8+Cjx2aWRlbyBpZD0idmlkZW8iIHNy Yz0iaHR0cHM6Ly9hcmNoaXZlLm9yZy9kb3dubG9hZC9CaWdCdWNrQnVubnlfMTI0L0NvbnRlbnQv YmlnX2J1Y2tfYnVubnlfNzIwcF9zdXJyb3VuZC5tcDQiIGNvbnRyb2xzIHBsYXlzaW5saW5lIGNv bnRyb2xzbGlzdD0ibm9mdWxsc2NyZWVuIj4K