[Webkit-unassigned] [Bug 205448] New: navigator.getGamepads() returns empty array in WKWebView

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205448

            Bug ID: 205448
           Summary: navigator.getGamepads() returns empty array in
                    WKWebView
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: iain at scirra.com

It's currently not possible to use the GamePad API within a hybrid application. Using the navigator.getGamePads() method in a WKWebview returns an empty array when a gamepad is attached, even after user interaction. Whereas Safari on the same device will return an array containing a Gamepad instance after user interaction.

I tried adding the Wireless Accessory Configuration capability to the application, but it had no effect. This was the only plausible sounding capability in the list.

Replication:
1. Connect gamepad to iOS device using bluetooth ( Dualshock 4 controllers are easy to setup )
2. Load http://luser.github.io/gamepadtest/
3. Press any button on the device ( required to "wakeup" the API )

Expected result:
Page displays controller status

Actual result:
Nothing happens

For a more minimal test you can call navigator.getGamePads() from the console and inspect the results.

Application was built in Xcode 11.3 (11C29) targeting iOS 12.0 and tested on iPad Pro ( ML0H2ZP/A ) on iPadOS 13.2.3 (17B111) with Sony DS4 ( CUH-ZCT1E ).

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