I think ANIMATOR_DURATION_SCALE is the corresponding setting. https://developer.android.com/reference/android/provider/Settings.Global#ANIMATOR_DURATION_SCALE

CCing Android forks. Note that this bug was filed in 'CSS Parsing and Computation', but all works for this should be done in widget/android and mobile/android.

https://treeherder.mozilla.org/#/jobs?repo=try&revision=796186ff46875c271ac9cb4035381433019e64e3 Detecting ANIMATOR_DURATION_SCALE changes depends on the machinery will be introduced in a patch for bug 1035774. And an automation test for this will be introduced in bug 1486971.

D'oh! I did miss one place to change a variable name. https://treeherder.mozilla.org/#/jobs?repo=try&revision=92f3d28812da14c621004793919d22735372fbc0

Hey jchen, there are two other settings relevant with animations on Android (in Developer options on my phone). https://developer.android.com/reference/android/provider/Settings.Global.html#TRANSITION_ANIMATION_SCALE https://developer.android.com/reference/android/provider/Settings.Global.html#WINDOW_ANIMATION_SCALE It seems to me that those two settings are only for application windows, such as animation effects during switching applications, and not for the contents inside applications, right? Or should we check all three settings' values are 0?

Right, I think it makes more sense to only check ANIMATOR_DURATION_SCALE.

Great, thanks jchen. Though dependent bugs haven't landed yet, but those shouldn't affect this bug basically, so I will put patches for this bug on review now.

Because we are going to use it for prefers-reduced-motion media feature which is tied to a system setting.

Depends on D5502

To make the test work properly, there needs two functions. One is just setting a value for testing and sending the notificaiton for the value changes, the other one is to reset the state for testing. The test itself will be introduced in bug 1486971, especially in https://phabricator.services.mozilla.com/D5004 Depends on D5503

Comment on attachment 9007969 [details] Bug 1478505 - Rename GeckoInputDeviceListener to GeckoSystemStateListener. r=jchen Jim Chen [:jchen] [:darchons] has approved the revision.

Comment on attachment 9007970 [details] Bug 1478505 - Implement prefers-reduced-motion on Android. r=jchen Jim Chen [:jchen] [:darchons] has approved the revision.

Comment on attachment 9007971 [details] Bug 1478505 - Run test_mq_prefers_reduced_motion_dynamic.html on Android. r=jchen Jim Chen [:jchen] [:darchons] has approved the revision.

Pushed by hikezoe@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/239fb18de868 Rename GeckoInputDeviceListener to GeckoSystemStateListener. r=jchen https://hg.mozilla.org/integration/autoland/rev/aea09f709ef6 Implement prefers-reduced-motion on Android. r=jchen https://hg.mozilla.org/integration/autoland/rev/759d828c5c2d Run test_mq_prefers_reduced_motion_dynamic.html on Android. r=jchen

https://hg.mozilla.org/mozilla-central/rev/239fb18de868 https://hg.mozilla.org/mozilla-central/rev/aea09f709ef6 https://hg.mozilla.org/mozilla-central/rev/759d828c5c2d

Documented — I've submitted a PR to update the compat data: https://github.com/mdn/browser-compat-data/pull/3080 And added a note to the Fx64 rel notes: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/64#CSS