Add Magnetometer API (#1848)

Co-authored-by: Daniel D. Beck <[email protected]>
Co-authored-by: Florian Scholz <[email protected]>

features/magnetometer.yml

@@ -0,0 +1,23 @@
+name: Magnetometer
+description: The `Magnetometer` API reads magnetic field sensor data from the device's magnetometer.
+spec: https://w3c.github.io/magnetometer/
+group: sensors
+compat_features:
+  - api.Magnetometer
+  - api.Magnetometer.Magnetometer
+  - api.Magnetometer.x
+  - api.Magnetometer.y
+  - api.Magnetometer.z
+# Enable when overlapping keys are allowed, https://github.com/web-platform-dx/web-features/issues/1173
+#  - api.Sensor
+#  - api.Sensor.activate_event
+#  - api.Sensor.activated
+#  - api.Sensor.error_event
+#  - api.Sensor.hasReading
+#  - api.Sensor.reading_event
+#  - api.Sensor.start
+#  - api.Sensor.stop
+#  - api.Sensor.timestamp
+#  - api.SensorErrorEvent
+#  - api.SensorErrorEvent.SensorErrorEvent
+#  - api.SensorErrorEvent.error

features/magnetometer.yml.dist

@@ -0,0 +1,12 @@
+# Generated from: magnetometer.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support: {}
+compat_features:
+  - api.Magnetometer
+  - api.Magnetometer.Magnetometer
+  - api.Magnetometer.x
+  - api.Magnetometer.y
+  - api.Magnetometer.z