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Re: [ambient-light] Request for Ambient Light Sensor web developer feedback (#64)

From: Raphael Kubo da Costa via GitHub <sysbot+gh@w3.org>
Date: Tue, 28 Sep 2021 13:25:00 +0000
To: public-device-apis-log@w3.org
Message-ID: <issue_comment.created-929207472-1632835497-sysbot+gh@w3.org>
> As we know, the way that existing sensors like the gyroscope are currently accessed is generally to bind to the `devicemotion` / `deviceorientation` event on window. In Safari you'd call `DeviceMotionEvent.requestPermission()` before receiving this information, and the information is further gated by permissions policy (or feature policy ).
> [...]
> * speculatively in WebKit browsers, calling `DeviceLightEvent.requestPermission()` if required.
> [...]
> To summarise, I do not believe there is much risk of harm in introducing ALS as it is today, or even under the `devicelight` event.

Just a few clarifications that don't disprove @willmorgan's points:

* There's a [Gyroscope spec](https://w3c.github.io/gyroscope) that is built upon the Generic Sensors framework. Chromium-based browsers expose it by default. In Chromium-based browsers, the `devicemotion` and `deviceorientation` events (which come from the [DeviceOrientation Event spec](https://w3c.github.io/deviceorientation/)) happen to have their internals implemented using the same code used to implement the Generic Sensors-based APIs, but the spec predates the Generic Sensors ones and they are not related.
* `DeviceMotionEvent.requestPermission()` exists in WebKit, but not in Blink.
* `DeviceLightEvent` and the `devicelight` event have not existed since 2016 (and they're not shipped by any web engine at this point). They were part of a [former incarnation](https://www.w3.org/TR/2015/WD-ambient-light-20150903/) of the Ambient Light Sensor spec, when it was not based on the Generic Sensors framework.

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