210261 2020-04-09 03:51:29 -0700 [iOS] DeviceMotionEvent returning value of NULL for acceleration and rotationRate on iOS 13.4 2020-04-09 16:06:19 -0700 1 1 1 Unclassified WebKit WebCore JavaScript Safari Technology Preview iPhone / iPad iOS 13 RESOLVED DUPLICATE 209831 P2 Critical --- 1 boris.stodic webkit-unassigned boris.stodic oldest_to_newest 1639560 0 395934 boris.stodic 2020-04-09 03:51:29 -0700 Created attachment 395934 sample for devicemotionevent Hi everyone, It seems like DeviceMotionEvent does not report accelerometer and rotation rate values correctly on iOS 13.4, for both Safari and Chrome. Even if permission is granted through requestPermission() method and event does get triggered, accelerometer and rotationRate value are defaulting to NULL. The same few-liner sample code(sample will be attached with this bug report) is working on previous versions of iOS v13.3>. I believe that in iOS 13.4 implementation of DeviceMotionEvent or DeviceMotionAPI is somehow broken. Few links which might be related to this issue: https://trac.webkit.org/changeset/259601/webkit https://bugs.webkit.org/show_bug.cgi?id=209831 In order to run the attached sample, a file has to be deployed on the https server. Steps to reproduce are: 1. Serve index.html on https 2. Load page 3. hit the button "Init DeviceMotion" 4. check browser console to see results for the event, event.acceleration, event.rotationRate Thanks, Boris 1639941 1 ap 2020-04-09 16:06:19 -0700 *** This bug has been marked as a duplicate of bug 209831 *** 395934 2020-04-09 03:51:29 -0700 2020-04-09 03:51:29 -0700 sample for devicemotionevent index.html text/html 668 boris.stodic PCFkb2N0eXBlIGh0bWw+DQo8aGVhZD4NCgk8bWV0YSBjaGFyc2V0PSJVVEYtOCI+DQoJ4oCLDQoJ PGxpbmsgcmVsPSJzdHlsZXNoZWV0IiB0eXBlPSJ0ZXh0L2NzcyIgaHJlZj0iLi9zdHlsZS5jc3Mi Pg0KCTxsaW5rIHJlbD0ic2hvcnRjdXQgaWNvbiIgaHJlZj0iZmF2aWNvbi5pY28iPg0KCeKAiwni gIsNCgk8c2NyaXB0IHR5cGU9InRleHQvamF2YXNjcmlwdCI+DQoJPC9zY3JpcHQ+DQo8L2hlYWQ+ DQrigIsNCuKAiw0KDQo8Ym9keT4NCgkJCeKAizxidXR0b24gb25jbGljaz0iaW5pdCgpIiB0eXBl PSJidXR0b24iPkluaXQgRGV2aWNlTW90aW9uRXZlbnQ8L2J1dHRvbj4NCgnigIsNCgk8c2NyaXB0 Pg0KCQlmdW5jdGlvbiBpbml0KCkgew0KCQkJRGV2aWNlTW90aW9uRXZlbnQucmVxdWVzdFBlcm1p c3Npb24oKQ0KCQkJCS50aGVuKHJlcyA9PiB7DQoJCQkJCWlmIChyZXMgPT09ICJncmFudGVkIikg ew0KCQkJCQkJd2luZG93LmFkZEV2ZW50TGlzdGVuZXIoJ2RldmljZW1vdGlvbicsIGUgPT4gew0K CQkJCQkJCWNvbnNvbGUubG9nKGUpOw0KCQkJCQkJCWNvbnNvbGUubG9nKGUuYWNjZWxlcmF0aW9u KTsNCgkJCQkJCQljb25zb2xlLmxvZyhlLnJvdGF0aW9uUmF0ZSk7DQoJCQkJCQl9KQ0KCQkJCQl9 DQoJCQkJfSkNCgkJCX0NCgk8L3NjcmlwdD4NCgnigIsNCjwvYm9keT4=