284375 2024-12-10 09:28:22 -0800 [visionOS] "gamepadconnected" event does not fire unless gamepad permission has already been given to Safari 2026-04-17 10:59:17 -0700 1 1 1 Unclassified WebKit WebCore Misc. Other Vision Pro visionOS 2 RESOLVED FIXED InRadar P2 Normal --- 1 abargas webkit-unassigned adachan beidson brandonstewart phyllis webkit-bug-importer youennf oldest_to_newest 2080522 0 473523 abargas 2024-12-10 09:28:22 -0800 Created attachment 473523 minimal repro page On visionOS 2, the "gamepadconnected" event does not fire unless Safari has already been given permission to access the gamepad. This permission dialog can be prompted by calling navigator.getGamepads from a page. However, since the "gamepadconnected" events do not fire without the permission, it requires a page to be preemptively calling navigator.getGamepads even if it does not think gamepads are connected. This behavior can be seen with the minimal test page attached. The steps to reproduce the behavior are: 1. Disconnect all gamepads from the Vision Pro. 2. Load test page. 3. Connect a gamepad to the Vision Pro and press buttons. 4. Observe that no "gamepadconnected" event is fired. 5. Observe that no permissions dialog to give gamepad permissions appears in Safari window. The expected behavior is that either the "gamepadconnected" event fires or the dialog appears when the gamepad is connected and the "gamepadconnected" event fires after accepted. Reproduces with: Version/18.0.1 Safari/605.1.15 (visionOS 2.0.1 physical device) 2082367 1 webkit-bug-importer 2024-12-17 09:29:14 -0800 <rdar://problem/141623162> 2082882 2 phyllis 2024-12-18 19:38:52 -0800 Adding more details to this issue - what happens on AVP is this: - The first time we call `navigator.getGamepads()`, Safari prompts user for permission via a banner. The call synchronously returns an array with no meaningful elements `[null,null,null,null]`. - If we call `navigator.getGamepads()` before permission is granted, it continues to return that array. - There is no API for us to actively query the permission state. Neither is there a callback function to be invoked when permission is granted or denied. - Even if the gamepad is connected via bluetooth, no `gamepadconnected` event will be emitted before permission is granted. Below is what I feel could be a bit troublesome to deal with: To trigger `gamepadconnected` event, **both** conditions must be met: a. User presses a button on the gamepad after granting permission (this is to mitigate fingerprinting, as specified in https://www.w3.org/TR/gamepad/ ) b. `navigator.getGamepads()` is called again When the above conditions are met, `gamepadconnected` event is emitted. Subsequent `navigator.getGamepads()` calls return an array with gamepad information. The order of actions in steps a and b can be interchanged, but both must occur for the `gamepadconnected` event to fire. If b happens first, the event is emitted when user presses a button on the gamepad. If a happens first, the event is emitted right after the next `navigator.getGamepads()` call returns (NOT when you press the button). Which is really weird, because that is not the time gamepad is connected, not the time gamepad is invoked (via a button press), nor the time permission is granted. It just so happens to randomly emit an event and the fact that gamepadconnected event only fires after a specific API call (and therefore the timing depends on when the client calls the API) doesn't seem to make much sense... You can use this for a repro on AVP device with VisionOS 2+: https://escapiststupor.github.io/gamepad-test 2199993 3 aleksei 2026-04-13 18:27:47 -0700 Pull request: https://github.com/WebKit/WebKit/pull/62694 2201588 4 ews-feeder 2026-04-17 10:59:15 -0700 Committed 311465@main (19ddb1eeb7ce): <https://commits.webkit.org/311465@main> Reviewed commits have been landed. Closing PR #62694 and removing active labels. 473523 2024-12-10 09:28:22 -0800 2024-12-10 09:28:22 -0800 minimal repro page index.html text/html 3191 abargas PCFET0NUWVBFIGh0bWw+CjxodG1sIHN0eWxlPSJoZWlnaHQ6IDEwMCU7Ij4KICAgIDxoZWFkPgog ICAgICAgIDx0aXRsZSBpZD0idGl0bGUiPkdhbWVwYWQgQ29ubmVjdCBTYW1wbGU8L3RpdGxlPgog ICAgICAgIDxsaW5rIHJlbD0ibWFuaWZlc3QiIGhyZWY9Im1hbmlmZXN0Lmpzb24iIGNyb3Nzb3Jp Z2luPSJ1c2UtY3JlZGVudGlhbHMiIC8+CiAgICAgICAgPG1ldGEKICAgICAgICAgICAgbmFtZT0i dmlld3BvcnQiCiAgICAgICAgICAgIGNvbnRlbnQ9IndpZHRoPWRldmljZS13aWR0aCwgaW5pdGlh bC1zY2FsZT0xLCB2aWV3cG9ydC1maXQ9Y292ZXIsIG1heGltdW0tc2NhbGU9MSIKICAgICAgICAv PgogICAgICAgIDxtZXRhIG5hbWU9ImFwcGxlLW1vYmlsZS13ZWItYXBwLWNhcGFibGUiIGNvbnRl bnQ9InllcyIgLz4KICAgICAgICA8bWV0YSBuYW1lPSJhcHBsZS1tb2JpbGUtd2ViLWFwcC1zdGF0 dXMtYmFyLXN0eWxlIiBjb250ZW50PSJibGFjayIgLz4KICAgICAgICA8bWV0YSBuYW1lPSJhcHBs ZS1tb2JpbGUtd2ViLWFwcC10aXRsZSIgY29udGVudD0iR2FtZXBhZCBDb25uZWN0IFRlc3QiIC8+ CiAgICA8L2hlYWQ+CgogICAgPGJvZHk+CiAgICAgICAgPG9sPgogICAgICAgICAgICA8Ym9keT5U aGlzIGlzIGEgc2FtcGxlIHBhZ2UgdGhhdCBzaG93cyBob3cgZ2FtZXBhZCBjb25uZWN0ZWQgZXZl bnRzIGludGVyYWN0IHdpdGggdGhlIFZpc2lvbiBPUyBnYW1lcGFkIHBlcm1pc3Npb25zIGRpYWxv Zy48L2JvZHk+PGJyPgogICAgICAgICAgICA8Ym9keT5UaGlzIHBhZ2UgYWRkcyBhbiBldmVudCBs aXN0ZW5lciBmb3IgdGhlICJnYW1lcGFkY29ubmVjdGVkIiBldmVudCB3aGVuIHRoZSBwYWdlIGxv YWRzLjwvYm9keT48YnI+CiAgICAgICAgICAgIDxib2R5Pkl0IGFsc28gY2FsbHMgbmF2aWdhdG9y LmdldEdhbWVwYWRzIG9uY2Ugb24gbG9hZCB0byBjaGVjayBmb3IgYWxyZWFkeSBjb25uZWN0ZWQg Z2FtZXBhZHMuPC9ib2R5Pjxicj4KICAgICAgICAgICAgPGJvZHk+VGhpcyBkZW1vbnN0cmF0ZXMg dGhlIHVzZSBjYXNlIG9mIGFuIGFwcGxpY2F0aW9uIHdhbnRpbmcgdG8gbW9uaXRvciB0aGUgZ2Ft ZXBhZCBzdGF0ZSBhbmQgcmVseSBvbiBldmVudHMgdG8ga25vdyB3aGVuIHRvIHN0YXJ0IGNoZWNr aW5nIHRoZSBzdGF0ZS48L2JvZHk+PGJyPgogICAgICAgICAgICA8bGk+RGlzY29ubmVjdCBnYW1l cGFkcyBiZWZvcmUgbG9hZGluZyB0aGlzIHBhZ2U8L2xpPgogICAgICAgICAgICA8bGk+T25jZSBw YWdlIGlzIGxvYWRlZCwgY29ubmVjdCBnYW1lcGFkIGFuZCBwcmVzcyBhIGJ1dHRvbjwvbGk+CiAg ICAgICAgICAgIDxsaT5PYnNlcnZlICJnYW1lcGFkY29ubmVjdGVkIGNvdW50IiBpcyAwPC9saT4K ICAgICAgICAgICAgPGxpPk9ic2VydmUgdGhhdCB0aGUgZ2FtZXBhZCBwZXJtaXNzaW9ucyBkaWFs b2cgZG9lcyBub3QgYXBwZWFyPC9saT4KICAgICAgICAgICAgPGJyPgogICAgICAgICAgICA8ZGl2 PgogICAgICAgICAgICAgICAgPGxhYmVsIGZvcj0iY29ubmVjdGVkY291bnQiPkNvbm5lY3RlZCBl dmVudCBjb3VudDwvbGFiZWw+CiAgICAgICAgICAgICAgICA8aW5wdXQgdHlwZT0ibnVtYmVyIiBp ZD0iY29ubmVjdGVkY291bnQiIG5hbWU9ImNvbm5lY3RlZGNvdW50IiBkaXNhYmxlZCB2YWx1ZT0i MCI+CiAgICAgICAgICAgICAgICA8bGFiZWwgZm9yPSJhbnljb25uZWN0ZWQiPkFyZSBnYW1lcGFk cyBjb25uZWN0ZWQ/PC9sYWJlbD4KICAgICAgICAgICAgICAgIDxpbnB1dCB0eXBlPSJjaGVja2Jv eCIgaWQ9ImFueWNvbm5lY3RlZCIgbmFtZT0iYW55Y29ubmVjdGVkIiBkaXNhYmxlZD4KICAgICAg ICAgICAgPC9kaXY+CiAgICAgICAgPC9vbD4KICAgIDxzY3JpcHQgdHlwZT0idGV4dC9qYXZhc2Ny aXB0IiBzcmM9InJhZ25hcm9rLmpzIj48L3NjcmlwdD48L2JvZHk+CiAgICA8c2NyaXB0PgogICAg ICAgIGZ1bmN0aW9uIGFyZUFueUdhbWVwYWRzQ29ubmVjdGVkKCkgewogICAgICAgICAgICByZXR1 cm4gISEobmF2aWdhdG9yLmdldEdhbWVwYWRzKCkuZmluZChnYW1lcGFkID0+IGdhbWVwYWQgIT09 IG51bGwpKTsKICAgICAgICB9CgogICAgICAgIGZ1bmN0aW9uIGNoZWNrQ29ubmVjdGVkR2FtZXBh ZHMoKSB7CiAgICAgICAgICAgIGxldCBhbnlDb25uZWN0ZWRDaGVja2JveCA9IGRvY3VtZW50Lmdl dEVsZW1lbnRCeUlkKCJhbnljb25uZWN0ZWQiKTsKICAgICAgICAgICAgaWYgKGFyZUFueUdhbWVw YWRzQ29ubmVjdGVkKCkpIHsKICAgICAgICAgICAgICAgIGFueUNvbm5lY3RlZENoZWNrYm94LnNl dEF0dHJpYnV0ZSgiY2hlY2tlZCIsICJ0cnVlIik7CiAgICAgICAgICAgIH0gIGVsc2UgewogICAg ICAgICAgICAgICAgYW55Q29ubmVjdGVkQ2hlY2tib3gucmVtb3ZlQXR0cmlidXRlKCJjaGVja2Vk Iik7CiAgICAgICAgICAgIH0KICAgICAgICB9CgogICAgICAgIGRvY3VtZW50LmFkZEV2ZW50TGlz dGVuZXIoIkRPTUNvbnRlbnRMb2FkZWQiLCAoKSA9PiB7CiAgICAgICAgICAgIGNoZWNrQ29ubmVj dGVkR2FtZXBhZHMoKTsKCiAgICAgICAgICAgIGxldCBwb2xsSWQgPSAwOwogICAgICAgICAgICB3 aW5kb3cuYWRkRXZlbnRMaXN0ZW5lcigiZ2FtZXBhZGNvbm5lY3RlZCIsICgpID0+IHsKICAgICAg ICAgICAgICAgIGxldCBjb25uZWN0ZWRDb3VudE51bWJlciA9IGRvY3VtZW50LmdldEVsZW1lbnRC eUlkKCJjb25uZWN0ZWRjb3VudCIpOwogICAgICAgICAgICAgICAgY29ubmVjdGVkQ291bnROdW1i ZXIudmFsdWUgPSBwYXJzZUludChjb25uZWN0ZWRDb3VudE51bWJlci52YWx1ZSkgKyAxOwogICAg ICAgICAgICAgICAgcG9sbElkID0gd2luZG93LnNldEludGVydmFsKGNoZWNrQ29ubmVjdGVkR2Ft ZXBhZHMsIDEwMCk7CiAgICAgICAgICAgIH0pOwogICAgICAgICAgICB3aW5kb3cuYWRkRXZlbnRM aXN0ZW5lcigiZ2FtZXBhZGRpc2Nvbm5lY3RlZCIsKCkgPT4gewogICAgICAgICAgICAgICAgaWYg KCFhcmVBbnlHYW1lcGFkc0Nvbm5lY3RlZCgpKSB7CiAgICAgICAgICAgICAgICAgICAgd2luZG93 LmNsZWFySW50ZXJ2YWwocG9sbElkKTsKICAgICAgICAgICAgICAgICAgICBwb2xsSWQgPSAwOwog ICAgICAgICAgICAgICAgICAgIGNoZWNrQ29ubmVjdGVkR2FtZXBhZHMoKTsKICAgICAgICAgICAg ICAgIH0KICAgICAgICAgICAgfSk7CiAgICAgICAgfSk7CiAgICA8L3NjcmlwdD4KPC9odG1sPgo=