Define Ambient Light Sensor as a powerful feature

Author: miketaylr

index.bs

@@ -40,7 +40,7 @@ urlPrefix: https://w3c.github.io/sensors/; spec: GENERIC-SENSOR
     text: default sensor
     text: implementation specific; url: implementation-specific
     text: reporting mode; url: reporting-modes
-    text: auto 
+    text: auto
     text: construct a sensor object; url: construct-sensor-object
     text: initialize a sensor object; url: initialize-a-sensor-object
     text: limit maximum sampling frequency; url: limit-max-frequency
@@ -222,8 +222,11 @@ subclass is the {{AmbientLightSensor}} class.
 The <a>Ambient Light Sensor</a> has a <a>default sensor</a>,
 which is the device's main light detector.
 
-The <a>Ambient Light Sensor</a> has an associated [=sensor permission name=]
-which is <a for="PermissionName" enum-value>"ambient-light-sensor"</a>.
+The <a>Ambient Light Sensor</a> is a [=powerful feature=] that is identified by the
+[=powerful feature/name=] "ambient-light-sensor", which is also its associated
+[=sensor permission name=]. Its [=powerful feature/permission revocation algorithm=] is the
+result of calling the [=generic sensor permission revocation algorithm=] with
+"ambient-light-sensor".
 
 The <a>Ambient Light Sensor</a> is a [=policy-controlled feature=] identified by the string "ambient-light-sensor". Its [=default allowlist=] is `'self'`.