Intent to Ship: touched attribute on GamepadButton
David Dorwin
Contact emails
Explainer
N/A
Spec
https://w3c.github.io/gamepad/#dom-gamepadbutton-touched
This is a single attribute in the existing specification so no separate TAG review has been requested.
Summary
The touched attribute allows developers to detect when a capacitive surface is being touched without being pressed. This is useful for gamepads with touchpads, like the Playstation 4 controller, because it will allow them to differentiate between gestures on the pad and clicks. It was added to the Gamepad spec two years ago but has been behind the GamepadExtensions feature flag since it was added to Blink. We want to enable it by default in Blink and separate it from the non-standard WebVR-specific extensions.
Link to “Intent to Implement” blink-dev discussion
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/IHrxKj4zGjg
Note: This intent also included the pose attribute, which was used for WebVR but is now obsoleted by WebXR.
Is this feature supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes, the API is supported on all platforms, but actual Gamepad support varies.
Demo link
There is a pull request to update a demo: https://github.com/luser/gamepadtest/pull/9
Risks
Interoperability and Compatibility
Both Firefox and Edge support this attribute, and this is the only [1] failure for Chrome in the Gamepad IDL harness test.
Edge: Shipped [2]
Firefox: Shipped
Safari: No signals (not implemented)
Web developers: Positive (used by WebVR developers for VR controllers)
Ergonomics
This attribute is implemented in the same way as the existing attributes, so there should be no additional concerns.
Activation
This is an additional state on an existing interface.
Is this feature fully tested by web-platform-tests? Link to test suite results from wpt.fyi.
As with the rest of the API, this attribute is covered by an IDL test: https://wpt.fyi/results/gamepad/idlharness.window.html
Entry on the feature dashboard
https://www.chromestatus.com/feature/5727206521176064
[1] All browsers fail the GamepadEvent interface object length test (issue).
[2] The current test failure in Edge is caused by a change to the IDL harness. (It had also affected Chrome 70.) https://developer.microsoft.com/en-us/microsoft-edge/platform/catalog/?q=specName%3Agamepad also indicates support.
Daniel Bratell
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Mike West
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